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A
killing; to have been caused
B
having killing; to have been caused
C
killing; to be caused
D
having killed; to have caused
正确答案 :A
解析
本题考查英语语法——非谓语。
句意“一架俄罗斯飞机在空中爆炸,机上224人全部遇难,大家都相信是伊斯兰国安放的炸弹造成的。”分析句子结构可知,逗号之前为主句,逗号之后为非谓语,kill和其逻辑主语之间构成主动关系,表达结果,用现在分词形式;在非谓语做结果状语的成分中,which引导定语从句,这里的cause发生在believe之前,不定式的完成式表示该动作发生在主句动作之前;另cause和其主语之间是被动关系。故A项符合题意。
B、C、D项为干扰选项,故排除。
故本题答案为A。
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