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        1. 【題目】—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:你認為這個舊機器有用嗎,奶奶?是的,它被用于取水。

          using是動名詞;use是動詞原形;used是過去分詞,構成被動語態(tài);useful有用的,是形容詞作表語,所以第一空用useful;短語be used for被用于做某事,第二空用used。故選B。

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