在La La Land的剧本中,
有一段是男主角的员工拿支票给男主角签名.
Employee: I got a check for you to sign.
Sebastian: How'd we do last month?
Employee: Not too bad.
Sebastian: Not too bad is great.
我想请问"How'd we do"的文法,
男主角在问上个月的收入的时候为什么会用这种时态呢?
我查了英英字典并没有查到合适的解释,
请各位大大帮忙指点.
谢谢.

How'd we do = How did we do 简单过去式 疑问句