I am not sure ______ he likes the black sweater or not.
A: that
B: whether
C: which
D: what
A: that
B: whether
C: which
D: what
举一反三
- I am not sure whether the news _____ he failed in the exam depressed him or not. A: that B: which C: what D: whose
- I am in doubt ______ I should buy it or not. A: if B: what C: whether D: which
- As far as I am ________, it is of no importance whether he will go or not．
- I don’t know ________ he will come or not. A: if B: whether C: that D: what
- 1. I wonder ________ he can attend the meeting or not. A: if B: whether C: that D: what