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The stones each ________ as much as two tons.

A.weighs 

B.are weighed

C.weigh 

D.is weighed

答案:C解析:本句主语stones 是复数形式,each 用作同位语时,对谓语动词的形式不产生影响,故谓语动词用复数形式;weigh 为连系动词,意为“重量是”,无被动语态,故答案为C。

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