---I’m sorry! I would have taken him to hospital if I had known he was seriously ill.
--- But ______.A.you didn'tB.you hadn'tC.he wasn'tD.you aren't
网友回答
A解析试题分析：考查时态：句意：--对不起，我要是知道他病的这么重，我就把他送到医院了。--但是你没有。第一句话是对过去的虚拟，而第二句话是过去没有做的事实，用一般过去时，选A。
考点：考查时态