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问题: 选择题,请帮忙分析正确选项,谢谢!

This is the best way that I think of _____your English.
A.improve
B. improveing
C.improved
D. to improve

解答:

选D,做某事的方式搭配为,way of doing sth or way to do sth.
所以句子为this is the best way to improve your english.
that i think of 为定语从句。