the reason for his success is _____ he worked harda.why b.that c.because d.for为什么选b?语法分析下

一道英语填空,What is the reason for his (s His father’s sudden death. What's reason for the difficulty of maintaining the cooperation? It's for that reason that reason这里的for能否换成it's because of that reason谢谢，但是that reason也是短语啊？原句是it's for that reason that the language of the USA is english nOBODY BELIEVED HIS REASON FOR BEING LATENOBODY BELIEVED HIS REASON FOR BEING LATE_____ his car broke down on the way.为什么? The reason for his being late is _____ he didn't catch the early bus. The reason why he was late was his always being late for school. Nobody knew the reason ____ his disappearance.A.to B.at C.for D.why for the reason怎么用 “for the reason”怎么翻译? 用for the reason造句 for the reason的中文翻译 the boy couldn't give the teacher a good reason for his being late for schoolhis为什么不能去掉 The reason for his going to France was that he got a new job there为什么是his 而不是he 看不懂这句,句子成份是什么?For this reason there is no risk to the customer in the practice,adopted by banks,of printing the customer's name on his cheques. What's reason for the difficulty of maintaining the cooperation?这是个问题,不是翻译. It's for that reason that the language of the USis English是什么句型 “He's the reason for the tears on my guitar”是什么意思? the reason for和the reason why的区别?