单项选择题

My sister is used to ______ with all the windows open.

A．sleep
B．sleeping
C．have slept
D．the sleeping
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单项选择题
It is high time we ______ .
A．leave
B．left
C．will leave
D．have left
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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