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24、Not until he failed in the examination _______ Cliff ______ the importance of careful preparation.

A.had; realized     B.did; realize C.was; realized    D.has; realized

24、B

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Not until he failed in the examination _______ Cliff ______ the importance of careful preparation.

A.had; realized     B.did; realize C.was; realized    D.has; realized

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