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

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Idon''tknow_____theyhavepassedtheexamornotA.whereB.ifC.whetherD.whenIdon''tknow_____theyhavepassedthee

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

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