In order to reduce the increasing prices of vegetables the toll if a truck carrying them

问题补充：

In order to reduce the increasing prices of vegetables, the toll if a truck carrying them passes through a toll station．

A. has cancelled

B. is cancelled

C. was cancelled

D. had been cancelled

答案：

A. has cancelled

(答案→)B. is cancelled

C. was cancelled

D. had been cancelled

解析：考察时态，句意：为了降低蔬菜价格，如果一辆装有蔬菜的卡车经过收费站，收费被取消了。可知该句叙述的是一个客观存在的事实，过去产生，今后还将进行下去的一个客观事实，故用一般现在时态。选B。