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        1. ---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(lái)做某事。Used to do sth過(guò)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(yǔ)學(xué)習(xí)機(jī)嗎?是的,它是被用來(lái)幫助我們提高英語(yǔ)的。故選A。
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