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____ I think and the problems could be settled.

学历类 专四 已帮助 人

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

 A. If you double your efforts  B. So long as you keep up your spirits

 C. Making greater efforts     D. A bit more efforts

热搜：关于氨基酸代谢错误的论述是_________。