单选题 Although I sympathize, I can"t really do very much to help.

【正确答案】 C

【答案解析】although：虽然。though也有此意。都能引导让步状语从句。Though he is old, he works hard.虽然他老了，但他仍然努力工作。because，since和for都不引导让步状语从句。