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the Philippines were still searching for the missing plane.此

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the Philippines were still searching for the missing plane.此句were可换成are吗?为什么用过去进行时
There were 239 people on board the Malaysia Airlines flight,including China,Vietnam,the US,Singapore,and the Philippines were still searching for the missing plane.
the Philippines were still searching for the missing plane.此
不能,因为这是过去式
因为它是在描述一件过去的事,在它的描述里这件事正在发生,s所以用过去进行时