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问题: 英语四级问题

he wishes he____ to the 99 international horticulture exposition in kun ming while he was in yunnan 答案是 had been 请问这道题的考点是什么?是虚拟语气吗?

解答:

是虚拟
wish后面接从句都是虚拟语气
而这道题中从句与过去事实相反
所以要用had done