5. 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 recognized
(B) was recognized as geochemistry
(C) then recognized as geochemistry
(D) as geochemistry was recognized
这个的答案是B,不过不是应该是was it recognized as geochemistry吗??这个题目本身有问题吗???
Although the Earth's chemical composition had been studied for years, geochemistry was recognized as a discipline in its own right toward the end of the nineteenth century。