【急】as is often the case中的as为什么不能换做which
问题描述：
【急】as is often the case中的as为什么不能换做which
as is often the case中的as为什么不能换做which
eg.As is often the case,he didn't study hard and failed to pass the exam.
答
不可以
as is often the case情况常常如此；这是常有的事；通常就是这样
这是固定说法