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:

選C。句中有并列連詞and，故應選擇C項。其中名詞短語相當于一個祈使句，完整的句子為：Make more efforts, I think, and all the problems could be settled.如選A , and要刪去。

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