—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　句意：“汽車的價格在過去的20年急劇下降�！薄斑@一點也不奇怪，因為市場規(guī)律決定產(chǎn)品的價格�！薄笆袌鲆�(guī)律決定產(chǎn)品的價格”說的是一個客觀事實，因此用一般現(xiàn)在時。

 

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