题目内容
— 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。吸尘器是被人用来清理垃圾,应该用被动语态形式,被动语态的结构:be + 动词的过去分词,故选B。
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