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英语
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He has been running since l came.
---------------（对画线部分提问）
---- --- --- he---- running?
这是现在完成进行时,应该如何提问?how long好像不适用吧.
人气：494 ℃ 时间：2020-05-10 11:46:59
解答
划线把since也划进去了,因此用How long
如果没有划since ,那么用since when .（没有见过这种结构,不过应该也说得通）
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