---What is that? Is it an English learning machine?---Yes. It ________ us to improve our EnglishA.is used for helpingB.used to helpC.used to helping
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A解析考察、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。