问题补充：
,I think , and the problems could be settled .
A. If you double you efforts
B. So long as you keep up your spirts
C. Making greater efforts
D. A bit more efforts
答案：
A. If you double you efforts
B. So long as you keep up your spirts
C. Making greater efforts
(答案→)D. A bit more efforts
解析：名词+and+句子
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