_____, I think, and the problems could be settled.
A. If you double your efforts B. So long as you keep up your spirits
C. Making greater efforts D. A bit more efforts
_____, I think, and the problems could be settled.
A. If you double your efforts B. So long as you keep up your spirits
C. Making greater efforts D. A bit more efforts
D
句首省略了make，完整的句型是“祈使句 + and + 陈述句”。