______ these questions may sound academic, answers to them could have profound e

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问题 ______ these questions may sound academic, answers to them could have profound economic and political significance.

选项 A、Since
B、Although
C、Unless
D、Lest

答案 B

解析在although引导的让步状语从句中，当从句主语和主句中的主语一致，而且从句谓语又包含be时，常用省略结构，如：I went on talking，although(I was)continually interrupted by him．虽然他不时地打断我的谈话，但我仍继续讲下去。

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