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
There is ______ h in the word hair.
A．a
B．an
C．the
单项选择题
Most of the scientists found his theory ______ too advanced.
A．very
B．fairly
C．rather
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