His success the fact he had been working hard.
A. put in; which
B. led to; because
C. lay in; that
D. got in; that
网友回答
A. put in; which
B. led to; because
(答案→)C. lay in; that
D. got in; that
解析：lie in在于，that引导一个同位语从句。put in(正式)提出、花费(时间)、插话、安装； lead to导致、结果；get in到站、当选、插话、上车、请来、加入。若单看第一空，lead to也对。