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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