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    The boys followed the marks that they ________, until finally they found their way back to the campsite.

    A．leftB．have leftC．had leftD．have been left

    C

    解析试题分析：考查时态。根据句意可知他们留下脚印是之前完成的事情，故使用过去完成时。句意：男孩们沿着他们之前留下的脚印直到他们找到回到营地的道路。故C正确。
    考点：考查时态

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