摘要：20． in the regulations that you should not tell other people the password of your email account. A．What is required B．What requires C．It is required D．It requires
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________ in the regulations that you should not tell other people the password of your email account.
[ ]
A. What is required
B. What requires is
C. It is required
D. It requires
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B. What requires is
C. It is required
D. It requires