一道定语从句的题目The reason is __________ he is unable to operate the machine.A.because B.why C.that D.Whether求详解

一道定语从句的题目The reason is __________ he is unable to operate the machine.A.because B.why C.that D.Whether求详解
一道定语从句的题目
The reason is __________ he is unable to operate the machine.
A.because B.why C.that D.Whether
求详解

一道定语从句的题目The reason is __________ he is unable to operate the machine.A.because B.why C.that D.Whether求详解
选择 C that 这是一个表语从句,然后从句 he is unable to operate the machine 又是一个完整的句子,不缺任何成分,所以用 that 引导,,
补充,答案很容易选择 why ,中式英语