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        1. 精英家教網 > 初中英語 > 題目詳情
          —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:——是用來干嘛的?——這是一個吸塵器,用來清理灰塵的。
          B.is used,表示被動語態(tài)(一般現在時+及物動詞的過去分詞),意為“…被用作’,符合題意。A.uses是第三人稱單數,C.is using 為現在進行時,D.used,use的過去式和過去分詞形式,均不符合題意。
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