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

解析本题考查被动语态的用法。smoking与know之间是被动关系，所以用被动语态is known。

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本试题收录于：大学英语三级A级题库大学英语三级分类

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