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
Say it again! I ______ quite catch it.
A． didn't
B． wouldn't
C． can't
单项选择题
Most of the scientists found his theory ______ too advanced.
A． very
B． fairly
C． rather
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