问题描述：
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.
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.
问题解答：
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