Much as ______, I couldn't accompany him to the concert because I simply didn't have any spare time.
【正确答案】 B
【答案解析】虚拟语气题。much as引导让步状语从句，表示“尽管”，该从句为与过去相反的虚拟语气，谓语使用“would+have done”，句中to后省略了accompany him to the concert，以避免重复。A语气不对，不表意愿。