单项选择题

Section B

By the time your plane lands tonight，I （） at the airport for 3 hours.

A．had waited
B．have been waited
C．had been waiting
D．will have been waiting

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单项选择题
Tired （） she was，there was no hope of her being able to sleep．

A．if
B．though
C．even if
D．unless
单项选择题
A survey of the opinions of students______ that they also admit several hours of sittingin frontof the computer______ harmful for one’s health．
A．show；are
B．shows；is
C．show；is
D．shows；are
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