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The past two years ________ a sharp rise in oil pricewhich adds to the burden of auto transportation industry.

Awitnessed?? ????????????? Bhas witnessed

Cis witnessing?? ????????????? Dwitnesses

 

【答案】

B

【解析】考查动词的时态。根据从句的时态可排除A项,主句主语为the past two years,故使用现在完成时态,表示动作已完成,而且这个动作的结果对现在的情况仍有影响。

 

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