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
科目：高中英語 來源： 題型：
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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