一I’m sorry! I would have taken him to hospital if I had known he was seriously ill.一But .

问题补充：

一I’m sorry! I would have taken him to hospital if I had known he was seriously ill.

一But .

A. you didn’t

B. you hadn’t

C. he wasn’t

D. you aren’t

答案：

(答案→)A. you didn’t

B. you hadn’t

C. he wasn’t

D. you aren’t

解析：

试题分析:考查动词时态。前句是对过去情况的虚拟，由此可知答语中应该用一般过去时表示过去的事实，根据前句动词would have taken 可知此处用动词did代替take，答案选A。句意：--对不起！如果我知道他病的厉害，我就带他去医院了。--但是你没有。