题目内容

_______ in the regulations that you should not tell other people the password of your e-mail account.?
A.What is required
B.What requires?
C.It is required
D.It requires?
C
句子中的it是形式主语,代替后面由that引导的主语从句。require的宾语从句中要用虚拟语气,It is ?required? 后接的主语从句中也要用虚拟语气,即should加动词?原形?。?
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