Hard work success while failure often laziness.
A. lies in; leads to
B. leads to; lies in
C. leads to; depends on
D. depends on; leads to
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A. lies in; leads to
(答案→)B. leads to; lies in
C. leads to; depends on
D. depends on; leads to
解析：考查固定短语。Lie in在于；lead to导致，通向；depend on依靠；句意：努力工作导致成功，而失败通常在于懒惰。