2. 外语
  3. No one is allowed (smoke) ______in public buildings according to the new regulation.

No one is allowed (smoke) ______in public buildings according to the new regulation.

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问题 No one is allowed (smoke) ______in public buildings according to the new regulation.
选项
答案to smoke
解析 allow后面既可以跟doing sth．也可以跟to do sth．，前者表示当前的状态下，“允许对方做…”，不用于被动语态，而后者表示“将来允许做…”，可用于被动语态。故填to smoke。
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