I went our last night,and she may have been reading.为什么用reading

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Iwentourlastnight,andshemayhavebeenreading.为什么用readingIwentourlastnight,andshemayhavebeenreading.为什么

I went our last night,and she may have been reading.为什么用reading
I went our last night,and she may have been reading.为什么用reading

I went our last night,and she may have been reading.为什么用reading
过去完成进行时?!