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

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 canceledB.had been canceled
C.has canceledD.had canceled

答案
A
解析

举一反三

3.In nature some animals actively defend the area_____________they depend for the resources.
A.in whichB.on whichC.whichD.Where

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14._______on May 12,2008, Wenchuan county has taken on dynamic new look gradually two years since then.
A.Although it destroyedB.Although destroyed
C.Although was destroyedD.Although destroying

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20.American women usually identify their best friend as someone ____ they can talk frequently.
A.whoB.asC.about whichD.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 crowdedB.So crowded is the classroom
C.As crowded the classroom isD.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 expectedB.As is expectedC.It is expectedD.What we expect

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