◎ 题干
---What is that? Is it an English learning machine?
---Yes. It ________ us to improve our English.
A. is used for helping          B. used to help     C. used to helping
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“---What is that? Is it an English learning machine?---Yes. It ________ us to improve our English.A. is used for helping B. used to help C. used to helping…”主要考查了你对  【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。