单选题
21.
______ 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
【正确答案】
C
【答案解析】
“规定里要求你的邮箱账号不可告诉其他人。”句型it is required that...，要求……。
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