The boy the teachers considered ______was caught _____ in the exam, which surprised us very much. [ ]

A. to be the best; cheating

B. as the best student; to cheat

C. to have been studied well; cheating

D. as a good student; to cheat

积极探索对政府立法项目尤其是经济立法项目的成本效益分析制度。政府立法不仅要考虑立法过程成本，还要研究其实施后的执法成本和（）。

A.社会成本

B.守法成本

C.运行成本

D.成本收益