【題目】— Excuse me, what's this for?
— It's a cleaner and it to pick up dirt.
A.uses
B.is used
C.is using
D.used

【答案】B
【解析】句意：—這是用來干嘛的？—這是一個吸塵器，用來清理灰塵的。it指代cleaner，與use之間構(gòu)成被動關(guān)系，故用被動語態(tài)，因此選B。

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