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    Prices keep going up these days _____ our salaries still remain unchanged.

    A. since
    B. when
    C. as
    D. while
    D
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    科目：高中英语 来源：0112 期中题 题型：单选题

    Prices keep going up these days _____ our salaries still remain unchanged.
    [     ]
    A. since
    B. when
    C. as
    D. while

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