—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(xiàn)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(shù)，C.is using 為現(xiàn)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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