I really don not know ____he will have time this afternoon or tomorrow morning

问题描述:

I really don not know ____he will have time this afternoon or tomorrow morning
A.that B.what C.whetherD.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whether不是和 or not连用吗or not 和or 都选whether