——It was the drug，not the disease，that killed the boy.
——He would be still alive today if he that drug.
A. not take
B. shouldn’t have taken
C. didn’t take
D. hadn’t taken
网友回答
A. not take
B. shouldn’t have taken
C. didn’t take
(答案→)D. hadn’t taken
解析：考查虚拟语气。本题为错综条件虚拟语气。主句与现在事实相反，从句与过去事实相反，故从句用had + done，选D。