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he exact cause of the ______ (kill) diseases w
问题详情
he exact cause of the ______ (kill) diseases was not known until a Chinese doctor discovered it by accident.请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：killing
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。
