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【题目】World No Tobacco Day on May 31st, and scientists have had the term “third-hand” smoke introduced to the public.

A. falls B. fell

C. has fallen D. is falling

【答案】A

【解析】考查时态句意:世界无烟日定于五月三十一日。根据句意可知用一般现在时态,World No Tobacco Day是句子的主语单数第三人称,故答案为A。

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