Nino Hernandez, who ________ only 10kg and is regarded as the world's shortest living man, has not

grown since he was 2 years old.[ ]

A. weighed  

B. had weighed

C. weighs  

D. has been weighed

净经营收入理论假定不管企业财务杠杆多大，债务融资成本和企业融资总成本是不变的。（）