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______ the reactions of people with this drug, scientists have learned more abou
______ the reactions of people with this drug, scientists have learned more abou
游客
2024-07-02
37
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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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