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
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单项选择题
Must we do it now No, you ______.
A. won’t
B. needn’t
C. can’t
D. don’t
单项选择题
Mary’s score on the test is the highest in her class; she ______ have studied very hard.
A. may
B. should
C. must
D. ought to
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