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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大学英语三级A级

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