2. 外语
  3. Smoking(know)______to increase a person’s risk of developing lung cancer.

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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