问题补充:
The past two years a sharp rise in oil price,which adds to the burden of auto transportation industry.
A. witnessed
B. witnesses
C. is witnessing
D. has witnessed
答案:
A. witnessed
B. witnesses
C. is witnessing
(答案→)D. has witnessed
解析:考查时态:句意:在过去的两年里我们目睹了油价的急剧上升,这增加了汽车运输业的负担。the past two years 是表示过去的两年中,是现在完成时的时间,此处是过去两年油价的上升对现在造成影响,故用现在完成时。选D,