一道英语选择题，拿来讨论一下,高手赐教！

I knew that if I wasn’t able to avoid a mistake,chances were that no other doctor _____,either. A.should have been B.could have been C.ought to have been D.must have been. 1.I knew 这里怎么翻译 2.我觉得这里不是虚拟语气，你们怎么看？ 3.Give reason for your choice 答：我也感觉这里