问题 选择题

They have had a long and bitter struggle _____their living conditions.

A.to improving

B.for improving

C.to improve

D.improve

答案

答案:C

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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