单项选择题

Mary asked John if it was the place ______ he bought the flowers.

A．what
B．that
C．which
D．where
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单项选择题
A boy told the policeman that he had seen a man ______.
A．to get on a car and drive off
B．getting on a car and drove off
C．get on a car and drive off
D．get on a car and drove off
单项选择题
Never ______ to the U. S. A..
A．I have been
B．do I have
C．have I been
D．have I do
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