The superstition is supposed to ___ in ancient times为什么要用have originated不用be originated?
问题描述：
The superstition is supposed to ___ in ancient times为什么要用have originated不用be originated?
这个是2006年英语专四的完形填空的一个空.
答
to have originated是动词不定式的主动式,originate是不及物动词“vi.发源”,不用被动式的to be originated