选择一个英语单词The reason why he didn't tell you the truth was（ ) he was not allowed to希望有解析A because B which C why D that
问题描述：
选择一个英语单词
The reason why he didn't tell you the truth was（ ) he was not allowed to
希望有解析A because B which C why D that
答
D表语从句，也算是宾语从句，而且从句结构完整，所以采用that，A是因果从句，B，c也可以用在从句里面，但前提是从句不完整！
答
去掉reason的定语why he didn't tell you the truth
句子变成：the reason was()he was not allowed to，意思是 他不告诉你真相的原因是他不被允许。
很明显的表语从句,选D。
在表语从句中，that不做成分，但是不可省略
答
The reason why...is/was that...这是一个很常用的句型：译为：之所以……是因为……why引导定语从句,修饰the reason; that引导表语从句,解释主语reason的内容.that引导的名词从句是完整的,that是个连词.Abecause引...