试题题干
Fill in each of the following blanks with a word or an expression.
A 
study of a language is concerned with the historical developments of the language over a period of time.
参考答案
试题解析
历时性研究关注的是语言经过一定时间阶段所发生的历史变化。
Fill in each of the following blanks with a word or an expression.
A study of a language is concerned with the historical developments of the language over a period of time.
历时性研究关注的是语言经过一定时间阶段所发生的历史变化。