题目：
_____, I think, and the problems could be settled. [ ]
A. If you double your efforts
B. A bit more efforts
C. Making greater efforts
D. So long as you keep up your spirits
答案：
答案：B
_____, I think, and the problems could be settled. [ ]
A. If you double your efforts
B. A bit more efforts
C. Making greater efforts
D. So long as you keep up your spirits
答案：B
