We witnessed one of the most beautiful natural wonders in the park today, when the top of the mountain was ___ by the setting sun and basked in a golden glow. (illuminate)

题目要求我们填写一个单词，使句子完整且通顺。句子描述了在公园里目睹了一个美丽的自然奇观，当山顶被落日的光辉照亮，沐浴在金色的光辉中。 首先，我们需要理解句子的结构和意思。句子的主干是“We witnessed one of the most beautiful natural wonders in the park today”，意思是“今天我们见证了公园里最美丽的自然奇观之一”。接下来的部分是具体描述这个奇观：“when the top of the mountain was ___ by the setting sun and basked in a golden glow”，意思是“当山顶被落日____，并沐浴在金色的光辉中”。 根据上下文，空白处需要一个动词的过去分词形式，表示“被落日____”。给定的单词是“illuminate”，意为“照亮”，符合句子的语境。将“illuminate”转换为过去分词形式“illuminated”，句子变为：“when the top of the mountain was illuminated by the setting sun and basked in a golden glow”，意思是“当山顶被落日的光辉照亮，并沐浴在金色的光辉中”。 因此，填入“illuminated”是正确的，完整句子为： “We witnessed one of the most beautiful natural wonders in the park today, when the top of the mountain was illuminated by the setting sun and basked in a golden glow.” 答案：illuminated