【題目】Now one of the hottest topics_______ people are talking about is the safety of food.

A. that B. who C. when D. which

【答案】A

【解析】試題分析：句意：現(xiàn)在最熱門的話題之一，人們談論的是食品安全。此題考查定語從句，因為先行詞前有最高級修飾，故選A。

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