单选题 By the end of this month, we surely ______ a satisfactory solution to the problem.
A. have found B. will be finding
C. will have found D. are finding

【正确答案】 C

【答案解析】[解析] 本题旨在考查谓语动词时态的用法。by意为“不迟于，到……为止”，通常要与完成时连用。由于本句的时间状语by the end of this month是表示“截止将来的某一时刻之前”的概念，因此谓语动词须用将来完成时，例如：By the end of next year, they will have finished the work on the new stadium. 到明年年底，新体育场就会竣工。由此可见，C项是正确答案。