, I think, and all the problems could be settled. A. If you make more efforts B. Ma

, I think, and all the problems could be settled.

A. If you make more efforts

B. Making more efforts

C. A bit more effort

D. To have made more efforts

答案

解析:

句中有并列连词and，故应择C项。其中名词短语相当于一个祈使句，完整的句子为：Make more efforts, I think, and all the problems could be settled.如A , and要删去。

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