单项选择题
It is high time we ______ .
A．leave
B．left
C．will leave
D．have left
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单项选择题
Dr. Smith, together with his wife and two sons, ______ to arrive on the evening flight.
A．are
B．are going
C．is
D．will be
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单项选择题
—Have you moved into the new house—Not yet. The room ______ .
A．is being painted
B．are painting
C．are painted
D．are being painted
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