31．—Can you tell me what time the flight to Detroit leaves? —I"m sorry, but it _

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31．—Can you tell me what time the flight to Detroit leaves?
—I"m sorry, but it ______．

A．has been canceled	B．had been canceled
C．has canceled	D．had canceled

答案

解析

略

举一反三

3．In nature some animals actively defend the area_____________they depend for the resources.

A．in which

B．on which

C．which

D．Where

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14．_______on May 12,2008, Wenchuan county has taken on dynamic new look gradually two y

ears since then.

A．Although it destroyed	B．Although destroyed
C．Although was destroyed	D．Although destroying

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20.American women usually identify their best friend as someone ____ they can talk frequently.

A．who

B．as

C．about which

D．with whom

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33．_________ in some rural schools that the teacher is even unable to walk through the rows of desks．

A．The classroom is as crowded	B．So crowded is the classroom
C．As crowded the classroom is	D．The classroom is such crowded

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22. _____in the office that anyone working on the computer should not tell other people the password of the Internet access.

A．What is expected

B．As is expected

C．It is expected

D．What we expect

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