问题
选择题
---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
答案
答案：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。