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Seventy percent of traffic accidents ____ because the drivers drink too much.

 

  A. is caused B. have caused C. are caused D. has caused

 

C

本题考查主谓一致和语态。seventy percent后的主语是复数名词,因此谓语用复数形式;cause与accidents间为被动关系,因此用被动语态。

 

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