摘要： Your trousers dirty, you must have washed. A. is, it B. are, it C. are, them D. is, them 答:C．表示成双成对的部分构成的物品如scissors剪刀.tongs钳子.glasses跟镜.clothes衣物.trousers裤子等做主语时.谓语用复数形式．指代它们的代词也用复数形式.若用a pair of 做主语时.谓语用单数形式.
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Your trousers ____dirty， you must have _____washed.
A. is； it B. are； it C. are； them D. is； them
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