问题描述：
——I have seen the film Titanic already.——When ＿＿
——I have seen the film Titanic already.
——When ＿＿＿you ＿＿＿it?
为什么填did see,不填have seen?
——I have seen the film Titanic already.
——When ＿＿＿you ＿＿＿it?
为什么填did see,不填have seen?
问题解答：
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