when I was passing by his room,he was talking with __ teacher.填the other?another?why?

问题描述:

when I was passing by his room,he was talking with __ teacher.填the other?another?why?

要根据上下文.
前文如果出现了两个teacher,那就填the other
前文如果没有出现,或者只有一个teacher,那就填 another
如果这是个单句,没有上下文,填another