His ability has never been in doubt----the question is or not he is prepared to work hard

发布时间：2020-08-17 01:29:31

His ability has never been in doubt----the question is      or not he is prepared to work hard.
A. that
B. if
C. where
D. whether

网友回答

A. that
B. if
C. where
(答案→)D. whether
解析：whether与or not可以连用，if与or not不可以连用，其他的选项都不与or not连用。故选D。
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