前面那个是在微信上看到的
这个完整版今天才在huasing看到哦 看到还以为是搞笑版
A：I don't know
B: I don't know
D: I don't know
A: I still don't know
B: I still don't know
D: I still don't know
A: now I know
B: after a know, I know
D: now I know too.

Question: do you know?