单项选择题

It’s quite early. We ______ worry about the time.

A. mustn’t
B. may not
C. needn’t
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单项选择题
What does the man plan to do
A. To go with the woman.
B. To join his roommate.
C. To stay at home.
单项选择题
--Happy birthday to you! --______.
A. The same to you
B. Thank you very much
C. OK
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