When comes to codes of ethics I think everyone should strictly obey them.A. thatB. thisC

问题补充：

When comes to codes of ethics, I think everyone should strictly obey them.

A. that

B. this

C. it

D. one

答案：

A. that

B. this

(答案→)C. it

D. one

解析：本题考查代词。When it comes to sth.当提及到……的时候，为固定搭配，故选C。