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：考查推测，would have done意思“对过去为发生事情的推测”，句子意思“我可能一会将要来，但是我不知道他们一直等我”，所以选D
