2. 外语
  3. ______ the reactions of people with this drug, scientists have learned more about the brain.

______ the reactions of people with this drug, scientists have learned more about the brain.

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问题 ______ the reactions of people with this drug, scientists have learned more about the brain.
选项 A、By studying
B、To study
C、They study
D、They’re studying
答案A
解析 by意为“通过、靠(……方式、手段)”，所引导的从句作表方式状语，同样的句子还有：What do you mean by opening my drawer?(你把我的抽屉打开是什么意思?)B的不定式相当于in order to，与下文不符合。C和D都是主语加谓语的结构，填入空中构成两个句子，显然不对。
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