9701-5

marshial

对这个句子不太理解，请朋友们讲解：

5. Although the Earth's chemical composition has been studied for years ,only toward the end of the nineteenth century______as a discipline in its own right.

A. when geochemistry was recognized

B. was geochemistry recognized

C. then recognized as geochemistry

D. as geofhimistry was recognized

linlin315

only提前要求主句倒装所以答案B

真老九

后面的主句由于有only引导的壮语提前，采用倒装句型，正常语序是 geochemistry was  recognizedas a discipline in its own right only toward the end of the nineteenth century