请教老师下面句子中的（）里可以填which吗?还是填as呢,还是都可以啊
问题描述：
请教老师下面句子中的（）里可以填which吗?还是填as呢,还是都可以啊
The British are not so familiar with different cultures and other ways of doing things,( ) is often the case in other countries
答
只能填as引导定语从句,这是固定结构. 即as is often the case
类似的还有：
as is mentioned above
as is often said
as is well known to all
as often happens等