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| 共计 2 道试题
1 . ______ is generally agreed that no one can learn all the knowledge all his life.
A.WhatB.AsC.WhichD.It
2 . ________ in the library regulations that any book borrowed should be returned by due time, or the borrower will be fined.
A.What is requiredB.It is required
C.What requiresD.It requires
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