问题补充:
I sooner but I didn’t know that they were waiting for me .
A. had come
B. was coming
C. would come
D. would have come
答案:
A. had come
B. was coming
C. would come
(答案→)D. would have come
解析:句意:要不我早来了,但是我不知道他们在等我。But后的内容可知我不知道他们在等我,因此我也没有早来。But后是真实的事实,相当于一个条件。But前是对过去的虚拟,对过去的虚拟主句应该用would have done,根据句意故选D。