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
______ makes men different from the other animals is that they can think and speak.
A．That
B．The thing
C．All
D．What
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