问题

There is no doubt ________ those who work hard will succeed sooner or later.
A:if
B:whether
C:why
D:that
B:whether
C:why
D:that
正确答案是:
同类题型
What are you looking ______? -My watch. I can’t find it now. Have you seen it anywhere? [ ]
Are you going to Tom’s birthday party?—_________.I might have to work.
We need to buy two ___________and some chicken for the dinner.
I think her dress comes from the 1970s.—It_________ be from that time. It looks so modern on her.
Do you know the young man well?—Sure, we __________ friends since we met in Nanjing three years ago.