单项选择题

Is a dog ______ animal

A．the
B．an
C．/
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单项选择题
What does he mean by ______ at us like that
A．smiling
B．smiles
C．smile
单项选择题
--How long ______ you ______ the bicycle--About two weeks.
A．have; had
B．have; bought
C．did; buy
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