【題目】At about 3:00amJuly 28, 1976, some people saw bright lights in the sky.

【答案】on
【解析】句意：1976年7月28日凌晨3點(diǎn)左右，一些人在天空中看到了明亮的燈光。在某一天用介詞on，故填on。

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