The teachers in our school had some activities_______the afternoon of March 28.A.in B.on

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Theteachersinourschoolhadsomeactivities_______theafternoonofMarch28.A.inB.onTheteachersinourschoolha

The teachers in our school had some activities_______the afternoon of March 28.A.in B.on
The teachers in our school had some activities_______the afternoon of March 28.A.in B.on

The teachers in our school had some activities_______the afternoon of March 28.A.in B.on
很高兴能够在这里回答你的问题,
选B
具体到某一天时,前面要用介词on
这里是三月28号那天的下午,已经具体到那天了,所以要用on
3月28日下午,我们学校的老师举行了一些活动.

选B
on+某一天（包括某天的上午、下午或晚上，）
in+年/月/ 季节
愿采纳！

b,具体到某日必须用on

一般情况下 afternoon morning 前面都用in
但是当句子具体到具体的月份日期的时候，时间介词要用on

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表示时间的这几个介词这样一起区分比较好记：

1. at 一般是时间点，时刻 at 6:00, at noon/night/midnight
2. on 一般是具体的某天,或用在具体的某一天的上午/下午等 on Sunday; on Sunday morning, on the afternoon of March 28; on clear nights 也是可以的(可以参考七下chpater8 课文)。
3. in 用在时间段,月份, 年份 in the morning/afternoon/evening; in July; in 1999; in July, 1999.
这样列举出来会发现这几个介词的使用规律：at-on-in 时刻-具体时间-时间段
这样得出结论要选B 用on.

收起

选B
具体到某天都用介词on，afternoon，morning都不影响
我们学校的老师们在3月28日下午进行了一些活动

选择in in the afternoon 表示具体的时间要是没有afternoon的话可以用on

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