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

 

4、B

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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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