The past two years ________ a sharp rise in oil price, which adds to the burden of auto transportation industry.A.witnessedB.has witnessedC.is witnessingD.witnesses
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B解析考查时态题。根据the past two years可知应该用现在完成时。本句是无生命的东西作主语，此处的the past two years作主语。witness 解释为：见证了。