2. 职称英语
  3. (By) the end of the nineteenth century, organic chemistry had (develop) new (met

(By) the end of the nineteenth century, organic chemistry had (develop) new (met

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问题 (By) the end of the nineteenth century, organic chemistry had (develop) new (methods) for the (synthesis) of dyes, perfumes, explosives, and medicines.
选项 A、By
B、develop
C、methods
D、synthesis
答案 B
解析
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