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    21．Milk quickly turns sour it’s in a fridge. A．until B．since C．as D．unless 【查看更多】

     

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    Milk quickly turns sour        it’s in a fridge.

    A．until                           B．since                   C．as                       D．unless

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    Milk quickly turns sour ________ it’s in a fridge．

    [　　]

    A．until

    B．since

    C．as

    D．unless

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