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 smoking与know之间是被动关系,所以用被动语态is known。
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