By the time he arrived at the stop, the 8 o'clock bus_____________(leave). So he had to wait for the next bus.

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By the time he arrived at the stop, the 8 o'clock bus_____________(leave). So he had to wait for the next bus.
By the time he arrived at the stop, the 8 o'clock bus_____________(leave). So he had to wait for the next bus.

By the time he arrived at the stop, the 8 o'clock bus_____________(leave). So he had to wait for the next bus.
had left 在他到达车站之前,公交已经开走,用过去完成时

had left 因为从句是过去时,主句的动作发生在从句之前,所以用过去完成时。

had left

had left 在他到达车站之前,公交已经开走,用过去完成时

had left
关键词是by the time he arrived短语里用的是过去式,这里考查过去的过去。
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