had been lining
Past perfect progressiveconjugation ofline.There are other translations for this conjugation.

line

One by one the huge dark chocolate layers fell down on a tablecloth to be immediately handed out among the people who had been lining up for several hours to taste them.
Una a una las enormes placas de chocolate oscuro caían sobre un mantel e inmediatamente se repartían entre los que hacían fila desde hacía varias horas para recibir su porción.
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