单项选择题

We'll try our ______ to help them.

A．first
B．greatest
C．best
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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
—What's the matter with your old clock—It doesn't ______.
A．walk
B．run
C．work
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