As the plane circled over the airport, everyone sensed that something was wrong. The plane was moving unsteadily through the air

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问题     As the plane circled over the airport, everyone sensed that something was wrong. The plane was moving unsteadily through the air, and【C1】______the passengers had fastened their seat belts, they were suddenly thrown forward. At that moment, the air-hostess【C2】______She looked very pale, but was quite calm. Speaking quickly but almost in a whisper, she【C3】______everyone that the pilot had fainted and asked if any of the passengers knew anything about machines or at【C4】______how to drive a car. After a moment’s hesitation, a man got up and followed the hostess into the pilot’s cabin. Moving the pilot【C5】______the man took his seat and listened carefully to the urgent instructions that were being sent by radio from the airport【C6】______. The plane was now dangerously close to the ground, but to everyone’s relief, it soon began to climb. The man had to【C7】______the airport several times in group to become【C8】______with the controls of the plane. But the danger had not yet passed. The terrible【C9】______came when he had to land. Following instructions, the man guided the plane toward the airfield. It shook violently【C10】______it touched the ground and then moved rapidly along the runway and after a long run it stopped safely.
【C10】

选项 A、as
B、unless
C、while
D、so

答案A

解析 本句句意为“飞机接触地面的时候剧烈震动……”。as意为“当……的时候”,符合句意。unless意为“除非”;while意为“当……时候”,它引导的从句动作时间比as引导从句动作的时间要长。so意为“因此”,不符合句意。所以答案为A)。
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