Условие задания:

Complete the sentences with the correct forms of the verbs in the brackets. Use the past perfect continuous.
1.  I did not go out last night because I (work)  all day.
2.  You got sick because you (eat)  all the time.
3.  The passengers (wait)  for four hours before the ground staff could finally give them information on the delay of their flight.
4.  She (learn)  Spanish at school.

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