Identify the correct conjunction to complete this sentence: ______ the experiment failed repeatedly, the team persisted with their research.
答案解析
核心考点：连词辨析与让步关系 解题思路：前后分句为转折关系，需选择让步连词。 选项分析：B选项'Although'正确连接让步状语从句；A表条件否定；C表因果关系；D用于对比。 易错点：容易混淆'although'与'whereas'的区别，后者强调对比而非让步。
正确答案：B