请教一道语法题

bni

According to findings derived from functional magnetic resonance imaging (MRI), the area of the brain in which a second or third language is stored depends on the age of the language learner; whereas each language occupies a distinct area of the brain in an adult learner, language areas overlap in a young child.

A
whereas each language occupies a distinct area of the brain in an adult learner,
B
whereas for adults each language occupies a distinct area of the brain and

B选项里，each language 不算主语吗？B选项的句子结构不完整

irissunflower

发一下原题吧

bni

irissunflower 发表于 2018-10-3 11:02
发一下原题吧

According to findings derived from functional magnetic resonance imaging (MRI), the area of the brain in which a second or third language is stored depends on the age of the language learner; whereas each language occupies a distinct area of the brain in an adult learner, language areas overlap in a young child.

A
whereas each language occupies a distinct area of the brain in an adult learner,
B
whereas for adults each language occupies a distinct area of the brain and
C
each language occupies a distinct area of the brain when they are learned by an adult, while
D
each language in adults occupied a distinct area of the brain, while
E
each language occupying a distinct area of the brain for an adult learner, and
答案选A

irissunflower

这句话主要考句子结构和语义。
B. ；之后，whereas引导从句之后没有主句，each language是从句里的主语，排除
C和D错在；之后的两个句子的语义关系是转折而不是对比，排除
E错在没有标明句子之间关系