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问题: 求救,一道英语题

Alice received an invitantion from her boss,____came as a surprise.
A.that B.it c.which D.what

解答:

C是答案.用排除法: that不用在非限制定语从句;it不能做关系代词; what用在名词性从句,不做关系代词用在定语从句.