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    Sharks have been in the earth for              years.

    A. thousands of
    B. two thousands
    C. two thousands of
    D. thousand of
    A
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    科目：初中英语 来源：月考题 题型：单选题

    Sharks have been in the earth for              years.
    [     ]
    A. thousands of
    B. two thousands
    C. two thousands of
    D. thousand of

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