This is idiomatic, it would be more helpful to make the hover-over hints select the whole phrase "Long time no see" and give the hint "好久不见". The status quo is incomplete, as there is nothing in the hints that shows "好".

Having whole-phrase-level hints is the way the more mature courses like German do it, and I think it leads to a superior learning experience. Can someone fix this soon? Thanks!

好has several meanings, it means good basically, but here it is a interjection， 好久 means “too long” or ‘how long it is that...’ 好just means ‘’too‘’ here， for example ‘她好漂亮啊’ means ‘she is too beautiful！’

Is there any chance of we become able to select the traditional Chinese in the future?

I had a go at: ”你好，好久不见了“. It wasn’t accepted, so I have suggested it.

Why "您好！好久不见！" is wrong? Is "您好" similar to "你好" or not?

你的“你还没死啊？”是指什么

你好！很久没见！should be accepted

你好！好久没见 should definitely be accepted. Its even used the words that the course taught