单项选择题

The headmaster required that all the teachers ______ at the meeting.

A．present
B．must be present
C．be present
D．would be present
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单项选择题
Your mother must be at home, ______ she.
A．mustn't
B．doesn't
C．isn't
D．needn't
单项选择题
--Do you think I can use your dictionary--______.
A．Yes, you may use
B．Yes, you can
C．Yes, help yourself
D．Certainly, go on
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