1、I don't think we've met before .You're taking me for _______.
A some other B someone else C other person D one other为什么不选ACD
2、Ahead of us walked a group of girls,_____ holding a flower in her hand.
A every B each为什么不用A
3、Mr John enjoyed himself again by working in the factory because he always hates _____ while staying alone at home all day long.
A it B that 选什么为什么

1. 根据英语中的习惯说法，A some other 后缺了 person ,C other person 前面少了some，D one other没有这种说法。
2.A every 不能单独做句子成分，必须和名词连用。

each=every+名词，它本身可以做代词，比如：I asked all the children and each told a different story.
还可以用于复数的主语后，比如：We each have a different point of view.
3 选 A it 做形式宾语，代替while staying alone at home all day long。that 是连接一个句子的，不能接短语。可以是 Mr John enjoyed himself again by working in the factory because he always hates that he is staying alone at home all day long.