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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