I insist that he medicine instead of law.A. has studiedB. studiesC. should studyD. studi

问题补充：

I insist that he medicine instead of law.

A. has studied

B. studies

C. should study

D. studied

答案：

A. has studied

B. studies

(答案→)C. should study

D. studied

解析：考查insist的用法：做为“坚持要求”的意思，insist后面的宾语从句用sb （should） do，做为“坚持说”，后面的宾语从句不用虚拟语气，句意是：我坚持要求他学习医学而不是法律。选C。