问题描述：
Sir,I'm sorry for not finishing my homework on time,but I have been very busy all these days.----N
----Sir,I'm sorry for not finishing my homework on time,but I have been very busy all these days.
----No excuse for it,but I_____ drop it this time.
A might B.can C.should D must
为什么?
----Sir,I'm sorry for not finishing my homework on time,but I have been very busy all these days.
----No excuse for it,but I_____ drop it this time.
A might B.can C.should D must
为什么?
问题解答：
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