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3.  ______, 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

C


解析:

选C。句中有并列连词and,故应选择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.如选A , and要删去。

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