_______ 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是形式主語(yǔ)，代替后面由that引導(dǎo)的主語(yǔ)從句。require的賓語(yǔ)從句中要用虛擬語(yǔ)氣，It is ?required? 后接的主語(yǔ)從句中也要用虛擬語(yǔ)氣，即should加動(dòng)詞?原形?。?
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