As we all know,numbers____in e-mail English to standnfor words.

题目

As we all know,numbers____in e-mail English to standnfor words.
A.used to
B.are used
C.are used to
D.use to

答案

usd to do 过去常常.
e.g.I usd to be a teacher.我以前是老师.（但现在不是了）
be used to 习惯于.
e.g.I used to eating rice.我习惯吃米饭了.
are used 是be+过去分词形式 是被动语态结构.
e.g.English is widely used in the world.
英语在世界被广泛的应用.
所以,我认为本题答案应为B 在e-mail中,数字被用于代替一些单词.