单项选择题

—Hello! Could I speak to Mr. Li, please
—______.

A．who are you
B．Speaking
C．I'm Mr. Wang
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单项选择题
The students didn't know ______ the post office, so they asked the policeman.
A．which to choose
B．what to show
C．how to get to
单项选择题
—May I come in —______.
A．Yes, please
B．No, you couldn't
C．No, you must
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