_____ 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
考查從句關(guān)系詞的選擇。根據(jù)句子結(jié)構(gòu)可知該句為主語(yǔ)從句，it 作形式主語(yǔ)。
="=what" is required in the regulations is that …………
="As" is required in the regulations, …………
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