The British are not so familiar with different cultures and other ways of doing things, ________ is often the case in other countries.
A.soB.asC.thatD.it在线课程B
解析：
句意为：“英国人对与其不同的文化和行为方式不太熟悉，其他国家也往往如此。”as引导非限制性定语从句，修饰前面全句的内容。