It is very kind of you to do the washing-up, but you    it.
A．mustn’t have doneB．wouldn’t have done
C．mightn’t have doneD．didn’t have to do
D
句意：洗了衣服你真是太好了，但是你沒有洗的。mustn’t have done表達不對，wouldn’t have done 不會做的，mightn’t have done 不可能做，didn’t have to do沒有必要做，根據(jù)語境應(yīng)選D。
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