If shethat Mary would come to see her, she would never have gone to the party.A. had known

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(答案→)A. had known
B. knew
C. knows
D. would know
解析：考查虚拟语气。本句是一个条件句的虚拟语气，条件句中使用过去完成时；主句使用“情态动词+have done”句意：如果她知道Mary来看她，她就不会去那个聚会了。故A正确。