, I think, and the problem could be settled,A. If you don’t doubt your effortsB. So long a

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

A. If you don’t doubt your effortsB. So long as you keep up your spiritsC. Making great efforts(答案→)D. A bit more efforts解析：句意，再努力点，我认为，问题就可能被解决。If you don’t doubt your efforts如果你不怀疑你的努力So long as you keep up your spirits只要你振作精神Making great efforts作出努力A bit more efforts再努力点，根据题意，故选D。

对的，就是这个意思