2. 外语
  3. It is very kind of you to do the washing-up, but you______it.

It is very kind of you to do the washing-up, but you______it.

admin2013-08-03  20
问题 It is very kind of you to do the washing-up, but you______it.
选项 A、mustn’t have done
B、shouldn’t have done
C、oughtn’t to have done
D、didn’t have to do
答案D
解析 考查情态动词的用法。mustn’t have done没有这种形式，对过去的否定推测要用conldn’t have done来表示。shouldn’t have done表示“本不应该做而做了”；oughtn’t to have done表示“本不应该做而做了”，含有责备的意思，不符合题意。本句不需要用到虚拟语气，D正确。
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