一般药物有效成分在肾排泄多少，认为对肾无害（）
A.<15%
B.<25%
C.<35%
D.<45%
E.<50%
参考答案：A
It was nothing but 10 years of hard work that _______his success in business.
A．led to
B．turned to
C．belonged to
D．replied to
