2. 外语
  3. Not until the late nineteenth and early twentieth centuries______as a unified science.

Not until the late nineteenth and early twentieth centuries______as a unified science.

admin2004-11-30  49
问题 Not until the late nineteenth and early twentieth centuries______as a unified science.
选项 A、did ecology emerge
B、when ecology emerged
C、ecology emerged
D、when did ecology emerge
答案A
解析
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