I don’t know ______ or not.
A: whether he is at home
B: if he is at home
C: that he is at home
D: whether is he at home
A: whether he is at home
B: if he is at home
C: that he is at home
D: whether is he at home
举一反三
- I don't know ______ he will come or not. A: if B: whether C: when
- I don’t know ________ he will come or not. A: if B: whether C: that D: what
- No sooner ______ than he was asked to start an another business trip. A: has he arrived home B: had he arrived home C: he had arrived home D: he arrived home
- He will go home after he finishes his work．He won’t go home ______ he finishes his work．
- I don't know _________ he will come tomorrow. _________ he comes, I'll tell you． A: if; Whether B: whether; If C: whether; Whether D: if; If