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A teenager saved her younger brother before______ by a truck

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A teenager saved her younger brother before______ by a truck on their way from school.
A.being killed
B.killed
C.killing
D.was killed
正确答案是:
A teenager saved her younger brother before______ by a truck
B
A正在被杀害
B为被杀害,过去分词表被动和完成
C杀害,现在进行是表正在进行和主动
D被杀害,用was即是用做谓语动词,此处缺少宾语
在从学校回家的路上,这个少年在她的弟弟被卡车压死之前救了他.
这句话可以看成省略的主语和谓语,完整为before he was killed...