___, 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 |
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___, 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 |
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