英语单项选择The reason for his absence is__he had his leg broken in the accident.A.when B.why C.that D.because选C,希望解释一下that在表语从句中做什么句子成分,和这个单选中包含的语法知识.

that在表语从句中起连接作用，没有实际意义
that在定语从句中既有连接作用，又有一定的成分

作表语，这是表语从句

that不做成分，只起连接的作用。

that 做代词的么
that 后面的句子为表语从句

that 引导表语从句,不做成分.
The reason for his absence is that he had his leg broken in the accident.
=Why he was absent is that he had his leg broken in the accident.
这是同意句转换,常考.

C

选C
这是表语从句，that只是一个连词，没有实际意义
有不会的可以再问我