Marriage was one of the first non-biological factors to be identified as improving life expectancy.

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问题 Marriage was one of the first non-biological factors to be identified as improving life expectancy.

选项 A、identifying
B、identified
C、being identified
D、to identify

答案B

解析 画线处是修饰non-biological factors的后置定语,由于identified和non-biological factors之间是被动关系,所以表示主动关系的A项和D项可以排除。C项强调当下的状况,表示“正在被看成”,题干的不定式则强调“即将被看成”,均为错误,故B项为正确答案,表示“已经被看成是……”。
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