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
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
You oughtn't to have been there, ______ （）

A. hadn't you
B. didn't you
C. oughtn't you
D. ought you
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