28. , I think, tired as you are, and the problem could be settled. A. Making great efforts B. So long as you keep up your spirits C. If you double your efforts D. A bit more efforts 查看更多

 

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________, I think, tired as you are, and the problem could be settled.

A. Making great efforts                     B. So long as you keep up your spirits

C. If you double your efforts            D. A bit more efforts

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