In order to reduce the increasing prices of vegetables, the toll____ if a truck carrying them passes through a toll station.A.has cancelledB.is cancelledC.was cancelledD.had been cancelled
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B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。