ecause of
because of后面接名词,名词词组,动名词,本句中failing是动名词,所以选because of
希望能帮到你,祝更上一层楼O(∩_∩)O
有不会的欢迎再继续问我(*^__^*)
再问： as ,becase,so 的用法能说一下吗 ，谢谢
再答： 1）because语势最强，用来说明人所不知的原因，回答why提出的问题，是句子中的重要部分，常放在句末，不能用其它三个替换。逗号可加可不加。 You can trust those products because the quality never changes. I haven't been to the cinema lately, because I am too busy. I didn't go, because I was afraid. 2）当原因是显而易见的或已为人们所知，就用as或 since。since稍正式一些。 Since /As the weather is so bad, we have to delay our journey. so是所以，表示结果。注意so 和because不能同时出现在句子中，即在英语中有“原因”就没有“结果”，有“结果”就没有“原因”。如 I haven't eaten any food for a day, so I'm very hungry.
