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【题目】—Do you think the old machine is ____________ grandma?

—Yes, it is _________for carrying water.

A.use; usingB.useful; usedC.use; usedD.useful; use

【答案】B

【解析】

句意:你认为这个旧机器有用吗,奶奶?是的,它被用于取水。

using是动名词;use是动词原形;used是过去分词,构成被动语态;useful有用的,是形容词作表语,所以第一空用useful;短语be used for被用于做某事,第二空用used。故选B

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