题目内容

Mary ________ her homework last night because she was ill.
A．didn’tB．didn’t doC．doesn’tD．doesn’t do
B

试题分析：句意：Mary昨晚没有做她的家庭作业，因为她生病了。句中有时间状语last night，所以我们可以知道这说的是过去的事，应该用一般过去时，否定句用助动词did，做作业是do one’s homework，故选B。
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