题目内容

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