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    The temperature of our earth will become higher and higher _____ we take actions right now.

    A. unless
    B. if
    C. as soon as
    D. as
    A
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    科目：初中英语 来源：河北省模拟题 题型：单选题

    The temperature of our earth will become higher and higher _____ we take actions right now.

    [     ]

    A. unless
    B. if
    C. as soon as
    D. as

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