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Although the Earth’s chemical composition had been studied for years, only towar
Although the Earth’s chemical composition had been studied for years, only towar
游客
2023-10-19
8
管理
问题
Although the Earth’s chemical composition had been studied for years, only toward the end of the nineteenth century______as a discipline in its own right.
选项
A、when geochemistry was recognised
B、was geochemistry recognised
C、then recognised geochemistry
D、as geochemistry was recognised
答案
B
解析
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