.By the end of the month,we surely ____a satisfactory solution to the problem.[A] will have found [B] will be finding [C] have found [D] are finding

.By the end of the month,we surely ____a satisfactory solution to the problem.
[A] will have found
[B] will be finding
[C] have found
[D] are finding

选A.by the end of 引导的句子,谓语动词常用完成时.
到月底,我们肯定能找到满意的问题解决方法.

A

a 将来完成时