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    —Car prices have been going down sharply in the last 20 years.

    —It's not surprising because the law of market ________ the price of a product.

    A．is controlling B．controls

    C．has controlled D．controlled

     

    B

    【解析】B 考察动词时态。由语境可知，市场规律控制商品价格，这是一个客观真理，因此应该使用一般现在时。故B正确。

     

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