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i would have asked him to attend our gathering but i ____his

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i would have asked him to attend our gathering but i ____his address
a didn't know b hadn't known c don‘t know d wouldn’t know 求权威专家解答
a.
but前的是对过去事情的假设即本过去应该发生却木有发生,而现在他说这句话了是因为那时没有他地址.动作有先后.
选b的话呢,就是死读书,翻译过来就很明知故问.
选c的话呢,好像虚拟语气没这个规定
选d的话呢,两个would我单单凭语感第一个排除