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' s a bird. But I don' t know ______ name.
A．it
B．his
C．its
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