—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
网友回答
A. is controlling
(答案→)B. controls
C. has controlled
D. controlled
解析：考查时态。在英语中客观真理都使用一般现在时来表示，句意：—在过去的20年里汽车的价格下降了很多。—这不奇怪，因为市场规律能够控制一个产品的价格。故B正确。