单项选择题

Can you tell me ________ there is plenty of rain in spring

A．how
B．why
C．when
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单项选择题
Tom is ________ as his sister.
A．as careful
B．as carefully
C．more careful
单项选择题
It is very hard for my husband to ______ smoking．
A．catch up with
B．keep up
C．give up
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