had been queuing
Pasado perfecto progresivo del verbo queue.

queue

Popularity
500+ learners.
In May 2006 about 12 000 persons had been queuing for hospital care over half a year, and in December 2006 their number was about 7 000.
En mayo de 2006 unas 12.000 personas llevaban más de seis meses esperando tratamiento hospitalario, y en diciembre de 2006 la cifra era de aproximadamente 7.000.
Palabra del día
cavar