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
We reached the station ________ the train had left．
A．A．before
B．B．after
C．C．until
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