试题题干
Fill in each of the following blanks with a word or an expression.
Historically, languages were 
before they were written down.
参考答案
试题解析
从历史角度看，语言在被写下来之前就已经被说过了。
Fill in each of the following blanks with a word or an expression.
Historically, languages were before they were written down.
从历史角度看，语言在被写下来之前就已经被说过了。