【題目】—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】考查時態(tài),此題可采用排除法,根據(jù)主語One third of my books可知主語為復數(shù),故謂語動詞用復數(shù)形式的,故排除B、C,因為B、C都是單數(shù),A.have后面動詞用done形式,即現(xiàn)在完成時結(jié)構(gòu),因為missing不是過去分詞,故排除A,所以答案是D,句意是我三分之一的書沒有了,表示現(xiàn)在還是一直沒找到。

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