高一英语语法一道
_____intheregulationsthatyoushouldnottellotherpeoplethepasswordofyoure-mailaccount.
A.Whatisrequired
B.Whatrequires
C.Itisrequired
D.Itrequires
请告诉我选哪个为什么
那为什么不能用what呢