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【题目】It is estimated that the number of tourists who travel abroad ______ in the past decade.

A.have doubledB.have been double

C.have been doubledD.has doubled

【答案】D

【解析】

考查时态。句意:据估计,出国旅游的人数在过去十年中翻了一番。根据in the past decade可知句子用现在完成时态,且主语是the number of“------的数量,后面的谓语动词用单数形式,故选D

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