单项选择题

There is ______ "h" in the word" hair".

A． a
B． an
C． the
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单项选择题
It's quite early. We ______ worry about the time.
A． mustn't
B． may not
C． needn't
单项选择题
Say it again! I ______ quite catch it.
A． didn't
B． wouldn't
C． can't
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