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—Excuse me, what’s this for?
—It’s a cleaner and it       to pick up dirt.
A.usesB.is usedC.is usingD.used
B
句意:——是用来干嘛的?——这是一个吸尘器,用来清理灰尘的。
B.is used,表示被动语态(一般现在时+及物动词的过去分词),意为“…被用作’,符合题意。A.uses是第三人称单数,C.is using 为现在进行时,D.used,use的过去式和过去分词形式,均不符合题意。
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