_____ in the library regulations that any book borrowed be returned by due time,
题型：不详难度：来源：
_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined．| A．What is required | B．It is required | | C．As is required | D．Which is required |
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答案
| B |
解析
考查从句关系词的选择。根据句子结构可知该句为主语从句，it 作形式主语。
="=what" is required in the regulations is that …………
="As" is required in the regulations, ………… |
举一反三
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