问题

We usually have our school trip _______ a morning of April.
A:in
B:at
C:to
D:on;
B:at
C:to
D:on;
正确答案是:
同类题型
Our teachers often ask us ______ over the answers carefully before handing in our papers.
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Thank you for reminding me of the time, otherwise I __ late yesterday—Don’t mention it.