—Excusemewhat'sthisfor?—It'sacleanerandittopickupdirt.A.usesBisusedCisusingD.used
— 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： 被动语态。吸尘器是被人用来打扫的。被动语态的结构： be + 动词的过去分词。故选择： B.
解析：句意：他去东营很多次了，所以他知道那儿的每一个角落。根据句意，发生的动作与现在有关系，故应用现在完成时，再则，他没在这儿，故答案应选 C 。
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