lt was his positive attitude to life and hard work finally led him to his successful career .
A. which
B. what
C. that
D. as
网友回答
A. which
B. what
(答案→)C. that
D. as
解析：句意：是他对人生的积极的态度和努力工作最后导致他的成功。这里用的是强调句，强调结构是：It is/was+强调部分+that…，判断是否是强调句的方法是：去掉强调结构，如果这句话仍然成立，就是强调句，这句话如果去掉强调结构是：His positive attitude to life and hard work finally led him to his successful.所以是强调句，所以选C。