一道有关which和one的英语题目
问题描述：
一道有关which和one的英语题目
Understanding the cultural habits of another nation,especially（ ）containing as many different cultures as USA is a diffcult thing.
A one B which
为什么是选A而不是B,理解为非限制定语从句不行吗?
which也能当主语吧？
答
用one,如果用which 就是明确指代前面说过的一个国家