问题描述: Where is my pen? have you seen _ ?填It or One? 1个回答 分类:英语 2014-10-10 问题解答: 我来补答 it!it 指代前面的pen ,因为已经提到过,所以用代词It,one 是指同类但是不同个的东西.比如i have no pen and i want to buy one 展开全文阅读