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【题目】—What's wrong? You look unhappy.
—One third of my books ___________ missing.

A.have
B.was
C.is
D.are

【答案】D
【解析】考查时态,此题可采用排除法,根据主语One third of my books可知主语为复数,故谓语动词用复数形式的,故排除B、C,因为B、C都是单数,A.have后面动词用done形式,即现在完成时结构,因为missing不是过去分词,故排除A,所以答案是D,句意是我三分之一的书没有了,表示现在还是一直没找到。

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