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
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