单项选择题

The boss punished him ______he should make the same mistake again.

A．incase of
B．unless
C．lest
D．so that
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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
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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