问题补充：
He was crazy his study when he was young, which contributes his success in later life.
A. for; to
B. about; to
C. about; on
D. for; on
答案：
A. for; to
(答案→)B. about; to
C. about; on
D. for; on
解析：考查短语中介词的习惯搭配。 be crazy about“对…疯狂”；contribute to “有助于,促成”
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