单选题 But that he came to help me, I______.
A. can't but succeed B. could not have succeeded
C. couldn't succeed D. didn't succeeded

【正确答案】 B
【答案解析】[解析] but that(要不是)引导的虚拟语气结构，从句部分是陈述语气，主句部分是虚拟语气。此外，分词短语或不定式短语也可引导暗含虚拟条件句。