The past two years a sharp rise in oil price which adds to the burden of auto transportat

问题补充：

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

A. has witnessed

B. witnessed

C. is witnessing

D. witnesses

答案：

(答案→)A. has witnessed

B. witnessed

C. is witnessing

D. witnesses

解析：考查时态题。此处的the past two years作主语。witness 解释为：见证了。句意：过去的两年见证了油价的快速增长，这增加了运输行业的负担。选A。