他跑了超过一个小时，所以彻底筋疲力尽了。
He had been running for over an hour, so he was completely exhausted.
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had英 /hæd/|美 /hæd/
been英 /biːn/|美 /bɪn/
running英 /ˈrʌnɪŋ/|美 /ˈrʌnɪŋ/
解释
过去完成进行时 had been running 表示在过去某个时间点（他感到疲惫的那一刻）之前持续进行的跑步动作，强调过程的持续导致的结果——筋疲力尽。
He had been running for over an hour, so he was completely exhausted.
过去完成进行时 had been running 表示在过去某个时间点（他感到疲惫的那一刻）之前持续进行的跑步动作，强调过程的持续导致的结果——筋疲力尽。