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() 4. Man’s understanding of nature is developing. It never stays at the same level.

     A. at the right time   B. for the first time

     C. from time to time   D. all the time

4.D

4.D 

(本题考查短语的辨析。句意:人类对自然的认识一直都是 在发展的。它永远不停留在同一个层次。“一直,总是”用all the time。故选   D. )

题目来源:2016年启东中学作业本九年级英语下册译林版 > 作业25 Grammar

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