Well,that was really a good meal.I--you were a really good c

Well,that was really a good meal.I＿＿you were a really good cook.B:Thank you.A.didn'tA:Well,that was really a good meal.I＿＿you were a really good cook.B:Thank you.A.didn't know B.don't know C:haven't known D.hadn't known该选哪一个啊?就在A和D之间,还有,另一套题中D选项是know,所以选A,根据过去完成时的用法,总感觉这个不是很严密根据过去完成时的用法,情境中应该描述的是过去吃完饭的过去，感觉选D啊，纠结