I didn’t know ________ they could pass the exam or not．A．why B．when C．that D．whether

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Ididn’tknow________theycouldpasstheexamornot．A．whyB．whenC．thatD．whetherIdidn’tknow________theycouldp

I didn’t know ________ they could pass the exam or not．A．why B．when C．that D．whether
I didn’t know ________ they could pass the exam or not．
A．why B．when C．that D．whether

I didn’t know ________ they could pass the exam or not．A．why B．when C．that D．whether
D,我不知道他们是否能通过考试,因为Weather.or not 是一个固定搭配,是否