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

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

A. has cancelled(答案→)B. is cancelledC. was cancelledD. 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。

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