I you how to deal with the matter, but why didn’t you ask me?
A. could show
B. were to show
C. had shown
D. would have shown
网友回答
A. could show
B. were to show
C. had shown
(答案→)D. would have shown
解析：句意：我将向你展示如何处理这件事情，但是你为什么不问我呢？这里指过去应该问我，而实际没有问，所以应该是虚拟语气，根据but why didn’t you ask me可知是对过去的虚拟，对过去的虚拟主句应该是would have done，根据句意故选D。