◎ 题干
(2013·东北三校4月联考)—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 controllingB.controls
C.has controlledD.controlled
◎ 答案
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◎ 解析
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◎ 知识点
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