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He wished he ___ more about the subject ,so he could talk ab

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He wished he ___ more about the subject ,so he could talk about it .
A had known B knew C would know D knows答案为什么选Cwished不是过去时吗,所以应该是与过去事实相反的虚拟选择A才对啊?
wish后面的宾语从句一般用虚拟语气,表示一种不可能实现的愿望.其谓语动词构成形式为:
过去时(宾语从句动作与wish同时)
过去完成时(宾语从句动作先于wish)
Could/would/might+动词原形,即过去将来时(宾语从句动作后于wish)
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