问题

I don’t doubt _____ he is a brilliant scientist, but can he teach?
A:whether
B:if
C:that
D:what
B:if
C:that
D:what
正确答案是:
同类题型
177. You should work hard. If you do so, you are expected to _______ the club.
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I always tell my students ______ on the road because it’s really dangerous.
Would you like to come to my house to watch the Voice of China together —________.