2. 职称英语
  3. Marriage was one of the first non-biological factors to be identified as improvi

Marriage was one of the first non-biological factors to be identified as improvi

游客2023-12-26  55
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 本题重点考查分词意义及用法。画线部分是不定式的被动式，表示“即将被看成是……”，这与整个句子的意思不符。从句子的谓语动词的时态来判断，应该是“已经被看成是……”。四个选项中首先可以排除D，用了不定式，而且没有用被动式。同样可以排除A，它用了现在分词表示“正在进行中”。B和C都表示被动，但C强调的是现在。故选B，过去分词表示“完成和被动”。
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