单项选择题

What does he mean by ______ at us like that

A．smiling
B．smiles
C．smile
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单项选择题
—What's the matter with your old clock—It doesn't ______.
A．walk
B．run
C．work
单项选择题
It is ______ picture.
A．so nice a
B．what a nice
C．both A and B
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