问题
选择题
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
答案
答案：B
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。