题目内容

I personally think__more listening, speaking, reading and writing is the key to__our English.
A．Doing; improveB．To do; improveC．Do; improvingD．Doing; improving
D
think后是宾语 从句，且缺少主语，the key to中 to是介词，后面要跟doing形式，而C项Do不能作主语，所以选D。
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