英语问题--单选In order to reduce the increasing preces of vegetables, the toll _____if truck carrying them passes through a toll station.A.has cancelled B. is cancelled C. was cancelled D. had been cancelled正确答

Question

英语问题--单选
In order to reduce the increasing preces of vegetables, the toll _____if truck carrying them passes through a toll station.
A.has cancelled B. is cancelled C. was cancelled D. had been cancelled
正确答案是B,我选的是C,收费在过去早就被取得,所以才保证卡车通过时被免费,为何不选过去式.请详细解析1.

Answer 1

Toll（过路费）是由国家人为免收的,因此A. has cancelled 不在选择之列.

句中没有表示早于  cancell 的过去时间状语,不存在过去完成时  D.   had  been  cancelled.

前面的reduce the increasing prices of vegetables（降低日渐高涨的菜价）是当前的举措,后面的if truck carrying them pass through a toll station（如果车辆运载蔬菜通过收费站）是也应该当前的条件,等于从句if truck carries them pass through a toll station.基于此,免收过路费是现行规定,因此应该用一般现在时B. is cancelled,而不是曾经免收过.