关于时间状语从句时态的问题
Brown wishes he had had more imagination when he _____that report.
A wrote B had written Cwould write Dwould have wrriten
选择A
让我疑惑的问题在于：wish 只能接虚拟语气,所以had had为对过去的虚拟；那为什么不选择D呢?
请帮我解释的详尽一点儿,