why did not you see the movie titanic 2 last night?because i it twice用have seen 还是had seen 请说明

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why did not you see the movie titanic 2 last night?
because i it twice
用have seen 还是had seen 请说明

这个区别很简单.
过去完成时的要求比较高,一般要一定的时间状语,或者在间接引语中.
一般像这种情况用现在完成时就可以了.