I sooner but I didn't know that they were waiting for me.
A. had e
B. was ing
C. would e
D. would have e
网友回答
A. had e
B. was ing
C. would e
(答案→)D. would have e
解析：考查虚拟语气。本题选项中既有表示过去事实的动词，又有表示过去动作的虚拟。句意：我不知道他们一直在等我，要不然我肯定会迅速点儿。根据句意可知，这里是对过去的虚拟，故用“would have done”的形式。