_____he had passed the exam surprised everyoneIt is required in the regulations that you should not tell other people the password of your e-mail account这句的主语是?

_____he had passed the exam surprised everyoneIt is required in the regulations that you should not tell other people the password of your e-mail account这句的主语是?
_____he had passed the exam surprised everyone
It is required in the regulations that you should not tell other people the password of your e-mail account这句的主语是?

_____he had passed the exam surprised everyoneIt is required in the regulations that you should not tell other people the password of your e-mail account这句的主语是?
you should not tell other people the password of your e-mail account

that you should not tell other people the password of your e-mail account 由that 引导的这个句子是主语，因为主语太长，为避免头重脚轻所以后置了

you should not tell other people the password of your e-mail account