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单选题
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.
A
when geochemistry was recognised
B
was geochemistry recognised
C
then recognised geochemistry
D
as geochemistry was recognized
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参考解析
解析：
虽然人类已经对地球的化学成分进行了长达数年的研究，但是直到19世纪末地球化学才成为一门独立的学科。因为是only放在句首，所以句子要倒装，谓语提前。
虽然人类已经对地球的化学成分进行了长达数年的研究，但是直到19世纪末地球化学才成为一门独立的学科。因为是only放在句首，所以句子要倒装，谓语提前。
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