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    13、They kept digging ________they must have known there was no hope.

    A. as                            B. while                 C. when                              D. unless

    13、C

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    A. as                            B. while                 C. when                              D. unless

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    科目：高中英语 来源：2008年5月山东省实验中学高三模拟考试、英语试题 题型：014

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