In order to reduce the increasing prices of vegetables , the toll(过路费)if a truck carrying

In order to reduce the increasing prices of vegetables , the toll(过路费) if a truck carrying them passes through a toll station .
A. cancels
B. is cancelled
C. was cancelled
D. had been cancelled

A. cancels(答案→)B. is cancelledC. was cancelledD. had been cancelled解析：考察时态及语态。句意：为了降低蔬菜正在升高的价格，当通过收费站时运菜的卡车的过路费被取消了。描述的是现在的一种客观状态，过路费是动作的对象，故用被动语态，一般现在时态，选B。

这个答案应该是对的