摘要：C。“at”用于具体的时刻前，“six o'clock”是具体的时间点，所以用at。
以下是50中考英语表达时间介词的选择填空题及参考答案解析：
一、题目
I usually get up ____ six o'clock in the morning.
A. in B. on C. at
We have a party ____ the evening of Christmas.
A. in B. on C. at
My birthday is ____ July.
A. in B. on C. at
She was born ____ a cold winter morning.
A. in B. on C. at
They will arrive ____ Beijing ____ the afternoon of May 1st.
A. in; in B. in; on C. at; in
The movie starts ____ 7:30 p.m.
A. in B. on C. at
He often goes fishing ____ weekends.
A. in B. on C. at
We had a meeting ____ Monday morning.
A. in B. on C. at
I like reading books ____ night.
A. in B. on C. at
She visited her grandparents ____ last Sunday.
A. in B. on C. /
The concert will be held ____ May 20th.
A. in B. on C. at
They left for Shanghai ____ a rainy day.
A. in B. on C. at
My sister gets home from school ____ about 5 o'clock.
A. in B. on C. at
We usually have a big dinner ____ New Year's Eve.
A. in B. on C. at
He was late for school ____ this morning.
A. in B. on C. /
The train leaves ____ 9:15.
A. in B. on C. at
She started learning English ____ 2010.
A. in B. on C. at
I'll see you ____ a few days.
A. in B. on C. at
They played football ____ the whole afternoon.
A. in B. on C. /
We watched a wonderful movie ____ the weekend before last.
A. in B. on C. /
My father goes to work ____ weekdays.
A. in B. on C. at
The shop opens ____ 8:00 a.m. to 9:00 p.m.
A. from B. at C. between
He'll come back ____ a month.
A. in B. after C. later
I met an old friend ____ my way home.
A. in B. on C. at
The accident happened ____ a Tuesday afternoon.
A. in B. on C. at
We are going on a trip ____ the summer vacation.
A. in B. on C. at
She often listens to music ____ her free time.
A. in B. on C. at
They got married ____ 1999.
A. in B. on C. at
I'll finish my work ____ an hour.
A. in B. on C. at
He sent me a message ____ midnight.
A. in B. on C. at
We celebrate Thanksgiving ____ November.
A. in B. on C. at
She was reading a book ____ the time I called her.
A. in B. on C. at
The plane takes off ____ half past ten.
A. in B. on C. at
They had a great time ____ the party last night.
A. in B. on C. at
I usually go to bed ____ around ten o'clock.
A. in B. on C. at
He came to China ____ 2008 and has lived here ever since.
A. in B. on C. at
The sports meeting will be held ____ next Friday.
A. in B. on C. /
She has a piano lesson ____ every Saturday.
A. in B. on C. /
I'm leaving for Paris ____ three days' time.
A. in B. on C. at
We visited the museum ____ a sunny morning.
A. in B. on C. at
The exam is ____ June 15th.
A. in B. on C. at
They went to the beach ____ the summer of 2020.
A. in B. on C. at
He'll arrive here ____ a moment.
A. in B. on C. at
I made a mistake ____ the first time I tried.
A. in B. on C. at
We had a picnic ____ a beautiful day last month.
A. in B. on C. at
The store closes ____ 9 o'clock in the evening.
A. in B. on C. at
She'll go to college ____ two years.
A. in B. on C. at
I got a letter from my friend ____ last week.
A. in B. on C. /
They have a meeting ____ the beginning of each month.
A. in B. on C. at
The show will start ____ ten minutes.
A. in B. on C. at
二、参考答案及解析
C。“at”用于具体的时刻前，“six o'clock”是具体的时间点，所以用at。
B。在具体某一天的晚上用“on”，“the evening of Christmas”是指圣诞节的晚上，是具体的一天的晚上。
A。在月份前用“in”，“July”是月份。
B。在具体的一个寒冷的冬天的早晨，是具体到某一天的早上，用“on”。
B。“arrive in + 大地点（城市、国家等）”，“Beijing”是大地点，用in；在具体某一天的下午用“on”，“the afternoon of May 1st”是具体日期的下午。
C。具体的时间点7:30 p.m.前用“at”。
B。“on weekends”意思是“在周末”，是固定搭配。
B。在具体的周一早上用“on”，“Monday morning”是具体的一天的早上。
C。“at night”是固定短语，意思是“在晚上”。
C。“last Sunday”前不需要介词，是时间状语。
B。在具体日期“May 20th”前用“on”。
B。在具体的一个下雨天用“on”，“a rainy day”是具体的一天。
C。在具体的时间点“about 5 o'clock”前用“at”。
B。在具体的“New Year's Eve”（除夕）这一天用“on”。
C。“this morning”前一般不用介词，作时间状语。
C。具体的时间9:15前用“at”。
A。在年份“2010”前用“in”。
A。“in + 一段时间”表示“在……之后”，“in a few days”意思是“几天后”。
C。“the whole afternoon”（整个下午）前不需要介词，作时间状语。
C。“the weekend before last”（上上个周末）前不需要介词，作时间状语。
B。“on weekdays”意思是“在工作日”，是固定搭配。
A。“from...to...”意思是“从……到……”，表示时间范围。
A。“in + 一段时间”表示“在……之后”，“in a month”意思是“一个月后”。
B。“on one's way home”意思是“在某人回家的路上”，是固定搭配。
B。在具体的周二下午用“on”，“a Tuesday afternoon”是具体某一天的下午。
A。在暑假“the summer vacation”期间用“in”。
A。“in one's free time”意思是“在某人的空闲时间”，是固定搭配。
A。在年份“1999”前用“in”。
A。“in + 一段时间”表示“在……之后”，“in an hour”意思是“一个小时后”。
C。“at midnight”是固定短语，意思是“在午夜”。
A。在月份“November”前用“in”。
C。“at the time”意思是“在……时候”，是固定搭配。
C。具体的时间“half past ten”前用“at”。
C。“at the party”意思是“在聚会上”，是固定搭配。
C。具体的时间点“around ten o'clock”前用“at”。
A。在年份“2008”前用“in”。
C。“next Friday”（下周五）前不需要介词，作时间状语。
C。“every Saturday”（每个周六）前不需要介词，作时间状语。
A。“in + 一段时间”表示“在……之后”，“in three days' time”意思是“三天后”。
B。在具体的一个阳光明媚的早晨用“on”，“a sunny morning”是具体的一天的早晨。
B。在具体日期“June 15th”前用“on”。
A。在“the summer of 2020”（2020年的夏天）这个时间段用“in”。
A。“in a moment”意思是“一会儿之后”，是固定搭配。
A。“in the first time”意思是“在第一次的时候”。
B。在具体的美好的一天用“on”，“a beautiful day”是具体的一天。
C。具体的时间点“9 o'clock”前用“at”。
A。“in + 一段时间”表示“在……之后”，“in two years”意思是“两年后”。
C。“last week”前不需要介词，作时间状语。
C。“at the beginning of...”意思是“在……开始的时候”，是固定搭配。
A。“in + 一段时间”表示“在……之后”，“in ten minutes”意思是“十分钟后”。
来源：蒙古元素