Smoking (know) ________ to increase a person’s risk of developing lung cancer.

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问题 Smoking (know) ________ to increase a person’s risk of developing lung cancer.

选项

答案is known

解析 smoking与know之间是被动关系，所以用被动语态is known。动词的过去分词形式一般是在原形后面加-ed，但也有一些词的变化比较特殊，需特别记忆，如know—known， begin—begun等。

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大学英语三级A级

大学英语三级

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