kollyxu1
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电影开始一段时间才是用 have been on
如 The film has been on for ten minutes .
When will the meeting begin
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When did the meeting begin
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我指的是会议开始一段时间，请问用什么？ have been后面的介词是什么？
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kollyxu1
也是用on 如 The meeting has been on a few minutes.
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