问题描述：
Tom have been working in the library every night
Tom have been working in the library every night over the last three months.
在过去的三个月里,应该用过去完成进行时才对啊?
Tom have been working in the library every night over the last three months.
在过去的三个月里,应该用过去完成进行时才对啊?
问题解答：
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