单项选择题

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
70()

A.student’s 
B.professor’s 
C.assistant’s 
D.librarian’s
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
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