填空题 Sam looked everywhere but still couldn't find his dictionary.
______ Sam looked everywhere, he still couldn't find his dictionary.

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【正确答案】 1、Although    
【答案解析】[名师解析] 原句是Sam到处寻找，可找不到他的字典。改写后该句变成了由 although引导的状语从句，因此填although。