8.【2020 •沈阳市】_______ Simon has done well in his studies, he still works really hard.
A. Since B. If C. Although D. Unless
【答案】C
【解析】句意：虽然Simon学习很好，但是他仍然努力学习。考查连词辨析。Since既然、自从……以来，引导原因状语从句和时间状语从句；If如果，引导条件状语从句；Although虽然，引导让步状语从句；Unless  除非，引导条件状语从句。根据Simon has done well in his studies,以及 he still works really hard.可知前后句之间存在一种相反的让步关系，所以用Although引导让步状语从句，故答案选C。