, I think, and the problem could be settled．
A. A bit more effort
B. So long as you keep up your spirits
C. If you doubt your efforts
D. Making great efforts
网友回答
(答案→)A. A bit more effort
B. So long as you keep up your spirits
C. If you doubt your efforts
D. Making great efforts
解析：可联系答.案.网客服索取。