高等继续教育 / 统考英语B
正确率：统考%
题型描述: 单选题
He studied hard in his youth, _ _ _ _ _ _ _ contributed to his great success in later life.
A. what
B. it
C. which
D. that
He studied hard in his youth, _ _ _ _ _ _ _ contributed to his great success in later life.
A. what
B. it
C. which
D. that
参考答案：