为啥是would rather do than do为啥不是 would rather do than doing than不是介词么0.

不是，固定搭配，与前面一致
比起做某件事，更愿意做某事

两个do是并列关系，就像I like doing and doing 一样，总之记好这个搭配就好。

would rather do than do此时的than是作连词,连词应连接两个队等成分,应此前后都用than
连接词 conj.
1.比,比较
She looks younger than she is.
她看起来比她实际岁数显得要年轻.
He runs a lot faster than I.
他跑得比我快多了.
2.(用于rather,sooner之后)与其...(宁愿...)
I would rather do some reading at home than go shopping with them.
与其和他们去购物,我倒宁愿留在家里读点书.
3.(用于else,other等之后)除了...(之外)
She has never been to a big city other than Chicago.
除芝加哥外她没有去过别的大城市.
4.(用于no sooner,scarcely,hardly之后)当,就
No sooner had we left the village than it began to rain.
我们刚离开村子,天就下起雨来了.
介词 prep.
1.【书】比
She is a teacher than whom no one is more patient.
她是个比谁都耐心的老师.
2.(后接计量数目)超过
My aunt stayed here for more than a week.