I really don not know ____he will have time this afternoon or tomorrow morningA.that B.what C.whether D.if

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I really don not know ____he will have time this afternoon or tomorrow morning
A.that B.what C.whether D.if

选C
whether.or 是否的意思
if在引宾语从句时也有是否的意思,但是不能和or连用

C 选择 与or连用

D 也是是否的意思 基本都用if