Not until the late nineteenth and early twentieth centuries______as a unified sc

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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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CITYARCHIVESAnineteenth-centurydocumentsBmapsCpersonalpapersDphotog