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
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Go along the street ______ you reach the end of the road.
A．if
B．when
C．until
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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