—Jack failed the driving test again.
—The question is we can help him avoid making the same mistake.
A. how
B. why
C. what
D. whom
网友回答
(答案→)A. how
B. why
C. what
D. whom
解析：句意：--杰克再次在驾驶考试中失败了。--问题是我们怎么能帮助他避免同样的问题。表语从句不缺主宾表，不能用what或who，why“为什么”不符合句意，所以选A。