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    By the year 2170, people _____ cities and industries on Mars.

    A. establish
    B. established
    C. will have established
    D. have established
    C
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    科目：高中英语 来源：0109 期末题 题型：单选题

    By the year 2170, people _____ cities and industries on Mars.
    [     ]
    A. establish
    B. established
    C. will have established
    D. have established

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