when did she became a movie star?
成为要用过去式became，因为她已经是明星了。
电影在这个情况下用movie比较好，这种说说法比较多。虽然film也是电影的意思，但是好像没有听他们怎么说过film star.
when did she become a movie star
注意应该用原型become因为前面的did已经表示过去了
When did she been a movie star?
When did she become a film star?
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