单项选择题

I wonder who drank all the milk yesterday. It ______ have been Peter because he was out all day.

A. mustn't
B. can't
C. won't
D. needn't
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______ each other for 10 years, they decided to meet this year.
A. Not having seen
B. Having not seen
C. No seeing
D. Seeing not
单项选择题
It is essential that these application forms ______ back as early as possible.
A. must be sent
B. will be sent
C. are sent
D. be sent
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