4、Certain trains _________ called off due to the terrible accident on July 23rd, they had to go there by plane.
A. were B. having been C. being D. had been
科目：高中英語(yǔ) 來(lái)源： 題型：
Certain trains _________ called off due to the terrible accident on July 23rd, they had to go there by plane.
A. were B. having been C. being D. had been
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