_________, I think, and the problems would be settled.
| A．If you double your efforts | B．Making more efforts |
| C．So long as you don’t lose heart | D．A bit more effort |
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_________, I think, and the problems would be settled.
| A．If you double your efforts | B．Making more efforts |
| C．So long as you don’t lose heart | D．A bit more effort |
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