I personally thinkmore listening, speaking, reading and writing is the key toour English.A

发布时间：2020-08-16 18:00:19

I personally think    more listening, speaking, reading and writing is the key to    our English.
A. Doing; improve
B. To do; improve
C. Do; improving
D. Doing; improving

网友回答

A. Doing; improve
B. To do; improve
C. Do; improving
(答案→)D. Doing; improving
解析：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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