As the plane circled over the ai

As the plane circled over the airport, everyone felt that something was 21______.The plane was moving unsteadily in the air. At that moment, the air-hostess 22______ She looked very pale, but was quite calm. Speaking quickly but 23______ in a whisper, she informed everyone that the pilot had fainted and asked if 24______ of the passengers knew anything about machines or at least how to drive a car. 25______ a moment's hesitation, man got up and followed the hostess into the pilot's cabin.
Moving the pilot aside, the man took his seat and listened carefully to the instruction that 26______ by radio from the airport below. The plane was now dangerously 27______ the ground, but to everyone's joy, it soon began to climb. The man had to 28______ the airport several times in order to become familiar with the controls. But the danger had not yet passed. The terrible moment came when he had to land. 29______ instructions, the man guided the plane towards the airfield. It shook violently as it touched the ground and then moved rapidly across the field, but after a long run it stopped 30______. Outside a crowd of people who had been watching anxiously rushed forward to congratulate the "pilot"on a perfect landing.
26.
A、are sent
B、were sent
C、were being sent
D、were sending
【正确答案】：C