单项选择题

Go along the street ______ you reach the end of the road.

A．if
B．when
C．until
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单项选择题
—Hello! Could I speak to Mr. Li, please—______.
A．who are you
B．Speaking
C．I'm Mr. Wang
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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