English File 4th Upper-Intermediate 3 and 4

When we got to Terminal 2, the flight from London ___. a. had already landed / b. had already been landing / c. already landed

When we arrived at the airport, we ____ that our flight was delayed. a. had discovered / b. were discovering / c. discovered

We ___ for about an hour when suddenly the plane began to lose height. a. had been flying / b. were flying / c. flew

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