This should also accept 'This is his old girlfriend'
Yes, it is also possible to say "This is his previous girlfriend".
I like "former" better. To me, "previous" contains at least the suggestion that he has a new one, whereas "former" seems more agnostic on that question (and therefore a better match for "以前的").
I read coogar when you say old girlfriend. Not ex-girlfriend and that is what they mean.
For the listening exercise - "this is her previous girlfriend" should be accepted as well. :D
Are there listening (type-what-you-hear) exercises in the Chinese course? I don't think I've encountered any, but if there are, I assume you mean that "她" should be accepted, which is certainly true.
Yes that is what I mean. There are no "type-what-you-hear" exercises by default, only the word bank ones, but I set them to type what you hear for extra practice.
You may also say 这是他前女友。i feel that this is literally most accurate.
The given answer sounds like " this is his girlfriend in the past"
Please Duolingo, surely 'former' rather than 'previous'.