单项选择题

It was very kind of you to do the washing-up, but you really ______ it.

A. needn’t do
B. shouldn’t have done
C. didn’t have to do
D. mustn’t have done
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单项选择题
As it turned out to be a small house party, we ______ so formally.
A. need not have dressed up
B. must not have dressed up
C. did not need to dress up
D. must not dress up
单项选择题
Must we do it now No, you ______.
A. won’t
B. needn’t
C. can’t
D. don’t
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