题目内容
() 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
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题目内容
() 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