Question

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

A．witnessed B．has witnessed

C．is witnessing D．witnesses

 

Answer 1

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。