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    Do you know how long our earth _____?

    A. came into existence
    B. came in existence
    C. was in existence
    D. has been in existence
    D
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    科目：高中英语 来源：0110 同步题 题型：单选题

    Do you know how long our earth _____?
    [     ]
    A. came into existence
    B. came in existence
    C. was in existence
    D. has been in existence

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