首先came是过去式,等车这个动作发生在bus来之前,也就是发生在过去的过去,所以用过去完成时；a few moments提示等车等了有一小段时间,在这个时间内动作是持续的,而wait是非延续性动词,所以要进行时态,过去完成进行时是指过去发生的动作对过去的持续的影响,句子意思为：公交车来之前他们已经等了一会儿了
They ----the bus a few moments when it came.这里为什
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