问题
选择题
________, I think, and the problem could be settled.
A．So long as you keep up your spirits
B．A bit more effort
C．If you doubt your efforts
D．Making great efforts
答案
答案：B
考查固定句型：名词短语+and/or+简单句，句意是：再多点努力，问题就解决了，其他几个选项都是状语，和并列连词and不符。选B。