30. , I think, and the problem could be settled A.lf you don’t doubt your efforts. B.So long as you keep up your spirits. C.Making great efforts D.A bit more efforts. 查看更多

 

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      , I think, and the problem could be settled

A.lf you don’t doubt your efforts.

B.So long as you keep up your spirits.

C.Making great efforts

D.A bit more efforts.

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