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---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
A
考察、used 用法。be used for doing sth表示用来做某事。Used to do sth过去常常做某事;used to sth习惯于某事。句意:那是什么?是一部英语学习机吗?是的,它是被用来帮助我们提高英语的。故选A。
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