13、______, I think, and the problem could be settled soon.

     A．Making more effort                            B．So long as you make more effort

     C．If you make more effort                     D．A bit more effort

13、D

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______, I think, and the problem could be settled soon.

     A．Making more effort                            B．So long as you make more effort

     C．If you make more effort                     D．A bit more effort

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