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_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined.
A.What is requiredB.It is required
C.As is requiredD.Which is required
B
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, …………
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