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【題目】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】

考查時態(tài)。句意:據估計,出國旅游的人數在過去十年中翻了一番。根據in the past decade可知句子用現在完成時態(tài),且主語是the number of“------的數量,后面的謂語動詞用單數形式,故選D。

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