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19.Scientists estimate that plants and animals lived _____ 3.5 billion years ago.(  )
A.as far asB.as many asC.as long asD.as old as

分析 科学家估计动植物三十五亿年前就生活在地球上了.

解答 答案:C
as far as远达,只要;as many as多达;as long as只要,和…一样长;as old as和…一样大.句意表达的是时间,故选C.

点评 介词用法灵活,搭配较多.学习时要注意积累,对常考的搭配结构要注意掌握.

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