in the regulation is that you should not tell other people the password of your e-mail acc

in the regulation is 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

(答案→)A. What is requiredB. What requiresC. It is requiredD. It requires解析：考查主语从句的应用。句意：规定里面要求的是你们不能将邮箱密码告诉别人。regulation 后面的is 是这句话的谓语，所以前面是句子的是主语，主语从句中缺少主语用what连接主语从句，C项没有用被动语态，CD项用的是形式主语it，那么句中多了一个is，选A.

正好我需要

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