有一道选择题___is orten the case,my mother has the final say in the argument

Question

选项有 it that what as 应该该是as 老师讲了 但没听懂 可以详细讲一下其他三项排除的原因吗 感激不尽

Answer 1

as is often the case 这是固定搭配,意为" 情况常常如此/通常就是这样" ，此处，as引导定从，指代后面整个句子，当然你也可以把as is often the case 看着一个整体。
若用 it,那么两句中间要用that相连,即 It is often the case that my mother has the final say in the argument. 这时， It 作形主， that从句作真正的主语。
that 和 what 只能引导名词性从句，而___is often the case,根本就不能成为一个名词性从句（即主从，宾从，表从，同位语从句）

Answer 2

it 一般是用作主语从句的 即it is orten the case that my mother has the final say in the argument。

that如果引导从句一般是定语从句 引导名词性从句是是什么都不缺用that使其名词化

what引导主语从句应是what is orten the case is that my mother has the final say in the argument.

望采纳

追问

那as 呢

追答

as 引导定语从句 意为正如 即as is orten the case,my mother has the final say in the argument。 my...argument为as所代指的