We can play a trick ()other()April 1st.a:on,in.b:at,on.c:on,on.d:at,in.

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We can play a trick ()other()April 1st.a:on,in.b:at,on.c:on,on.d:at,in.
We can play a trick ()other()April 1st.a:on,in.b:at,on.c:on,on.d:at,in.

We can play a trick ()other()April 1st.a:on,in.b:at,on.c:on,on.d:at,in.
C
play a trick on 开玩笑
on April 1st 强调某一天用on
一段时间用in 时间点用at