I don't know _____ they have passed the exam or notA.where B.if C.whether D.when

分类: 作业答案 • 2022-01-02 15:53:26

问题描述：

I don't know _____ they have passed the exam or not
A.where B.if C.whether D.when

答

选C
whether...or not
I don't know 【whether】 they have passed the exam or not
我不知道他们有没有通过考试.