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The past two years ______a sharp rise in oil price, which adds to the burden of auto transportation industry.
A.has witnessed B.witnessed
C.is witnessingD.witnesses
A

试题分析:考查时态题。此处的the past two years作主语。witness 解释为:见证了。句意:过去的两年见证了油价的快速增长,这增加了运输行业的负担。选A。
点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。这题的解题关键是The past two years,说明是过去到现在一直做的事情。
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