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How much         this pair of pants?
A.areB.isC.amD.it’s
B

试题分析:句意:这条裤子多少钱?这个句子的主语是this pair of pants,谓语动词的单复数应该根据pair来确定,这里pair是单数,所以谓语动词应该用单数,故选B。
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