, I think, and the problem could be settled.A.If you make your effortsB.So long
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_____ , I think, and the problem could be settled.
A.If you make your efforts
B.So long as you keep your spirits
C.A bit more efforts
D.making great efforts
试题答案
C
这题考查句型：祈使句或名词，and/or+简单句，句意是：我想再多些努力问题就被解决了。选C。