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, I think , and the problem could be settled. A.Making great efforts B.So long a

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, I think , and the problem could be settled. A.Making great efforts B.So long a

______ , I think , and the problem could besettled.

A.Making great efforts

B.So long as you keep up your spirits

C.If you double your efforts

D.A bit more effort

 

试题答案

【答案】

D

【解析】略