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I don't know ____ they have passed the exam.A.what B.if C.when D.where谢谢了,

分类: 作业答案 • 2022-09-26 00:14:46

问题描述：

I don't know ____ they have passed the exam.A.what B.if C.when D.where谢谢了,

答

选B.考查宾语从句的用法,根据语意“是否”,因此只能用if或whether.