—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 考察動詞時態(tài)。由語境可知，市場規(guī)律控制商品價格，這是一個客觀真理，因此應(yīng)該使用一般現(xiàn)在時。故B正確。

 

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