Public transportation to the construction area_____because of concern for passenger safety.

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问题 Public transportation to the construction area_____because of concern for passenger safety.

选项 A、was discontinuing
B、discontinues
C、discontinue
D、was discontinued

答案D

解析空格处应该填入动词。discontinue是及物动词，意为“中断”，而空格后没有宾语，因此应该使用被动态was discontinued.

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