I really don not know ____he will have time this afternoon or tom_英语解答

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

人气：437 ℃　时间：2019-10-14 01:16:09

解答

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