2. 外语
  3. he exact cause of the ______ (kill) diseases was not known until a Chinese doctor discovered it by accident.

he exact cause of the ______ (kill) diseases was not known until a Chinese doctor discovered it by accident.

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问题 he exact cause of the ______ (kill) diseases was not known until a Chinese doctor discovered it by accident.
选项
答案killing
解析 句意：致命疾病的确切原因偶然被一名中国医生发现了。killing：n. 致命，致死。
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