---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表示用來做某事。Used to do sth過去常常做某事；used to sth習(xí)慣于某事。句意：那是什么？是一部英語學(xué)習(xí)機(jī)嗎?是的，它是被用來幫助我們提高英語的。故選A。
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