单选题 15.  When dealing with a conflict between two staff members, I find it best to handle the matter as ______ as possible.
【正确答案】 C
【答案解析】 选项A错误，tightly意思是“坚固地”。选项B错误，extremely意思是“极其，极端地”。选项C正确，discreetly意思是“小心地，谨慎地”。选项D错误，incrementally“递增地，增值地”。