试题题干
The history of foreign language teaching can be traced back to the ancient Roman when（ ）was taught as a second language.
参考答案
正确答案：
试题解析
外语教学的历史可以追溯到古罗马时期，当时拉丁语被作为第二语言进行教授。
The history of foreign language teaching can be traced back to the ancient Roman when（ ）was taught as a second language.
外语教学的历史可以追溯到古罗马时期，当时拉丁语被作为第二语言进行教授。