公交车终于到了的时候，站台上的人已经等了四十分钟。
People at the stop had been waiting for forty minutes when the bus finally arrived.
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had英 /hæd/|美 /hæd/
been英 /biːn/|美 /bɪn/
waiting英 /ˈweɪtɪŋ/|美 /ˈweɪtɪŋ/
解释
had been waiting 是过去完成进行时，表示在公交车到达之前一直在等的持续状态。
People at the stop had been waiting for forty minutes when the bus finally arrived.
had been waiting 是过去完成进行时，表示在公交车到达之前一直在等的持续状态。