试题题干
According to the records available, we believe that human beings have been involved in the study of language for at least （ ） centuries.
参考答案
正确答案：
试题解析
根据现有的记录，人类从事语言研究已经有25个世纪了。
According to the records available, we believe that human beings have been involved in the study of language for at least （ ） centuries.
根据现有的记录，人类从事语言研究已经有25个世纪了。