As we all know,numbers_______in e -mail English to stand for words.

问题描述:

As we all know,numbers_______in e -mail English to stand for words.
A.used to B.are used C.are used to D.use to 我知道答案是C 但是为什么呢 感觉是C

这里横线上缺了一个被动语态的动词,因此排除A和D答案.
固定搭配use sth to do sth,把它变形为被动语态就是:sth is used to do sth
因此最后得出答案B,因此C答案是错的
句子翻译是:众所周知,在邮件英语里数字被用来代表文字.