They have had a long and bitter struggle their living conditions.A. to improvingB. for imp

发布时间:2020-08-17 14:08:11

They have had a long and bitter struggle     their living conditions.
A. to improving
B. for improving
C. to improve
D. improve

网友回答

A. to improving
B. for improving
(答案→)C. to improve
D. improve
解析:不定式常修饰动词状语,表示行为的目的、结果、原因等。for+动名词一般不做目的状语,但for+名词化了的动名词可作原因状语
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