单项选择题

My little sister is only five, ______ she can swim well.

A．but
B．so
C．because
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单项选择题
Hurry up. Don't keep Xiao Wang ______.
A．wait
B．waited
C．waiting
单项选择题
It ______ heavily so there was deep snow on the road.
A．snows
B．snowed
C．had snowed
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