I decided that the best way to do this was to become a flight attendant.

问题描述:

I decided that the best way to do this was to become a flight attendant.
这里的“was to become a flight attendant.”为什么用to do形式?还有 be doing与be to do怎么区分?

that引导宾语从句.
相当于the best way was .这里不定式充当表语.不能用be doing