单项选择题

Your mother must be at home, ______ she.

A．mustn't
B．doesn't
C．isn't
D．needn't
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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
单项选择题
It was for this reason ______ she left her homeland and moved to a mountain village.
A．why
B．for
C．which
D．that
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