By the end of this month, we surely ______ a satisfactory solution to the proble

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问题 By the end of this month, we surely ______ a satisfactory solution to the problem.

选项 A、will be finding
B、will have found
C、are finding
D、have found

答案 B

解析动同时态。由介词引导的短语表示“到……时为止”， “在……之前，不迟于”，与之连用的谓语动词常用完成时态。又因this month表示将来时间，因此要用将来完成时态。

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