—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(jià)格在過(guò)去的20年急劇下降�！薄斑@一點(diǎn)也不奇怪，因?yàn)槭袌?chǎng)規(guī)律決定產(chǎn)品的價(jià)格�！薄笆袌�(chǎng)規(guī)律決定產(chǎn)品的價(jià)格”說(shuō)的是一個(gè)客觀事實(shí)，因此用一般現(xiàn)在時(shí)。

 

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