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    The air in Beijing is getting much _____________ now than a few years ago.

    A. clean
    B. cleaner
    C. cleanest
    D. the cleanest
    B
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    科目：小学英语 来源：专项题 题型：单选题

    The air in Beijing is getting much _____________ now than a few years ago.

    [     ]

    A. clean
    B. cleaner
    C. cleanest
    D. the cleanest

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