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

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【31】the passengers had fastened their seat belts, they were suddenly thrown forward. At that moment, the air-hostess【32】. She looked very pale, but was quite【33】. Speaking quickly but almost in a whisper, she【34】everyone that the pilot had fainted and asked if any of the passengers knew anything about machines or at least how to drive a car. After a moment’s【35】, a 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 urgent instructions that were being sent by radio from the airport below. The plane was now dangerously close【36】the ground, but to everyone’s relief, it soon began to climb. The man had to【37】the airport several limes in order to become【38】with the controls. Therefore the danger had not yet passed. The terrible【39】came when he had to land. Following information, the man guided the plane toward the airfield. It shook violently【40】it touched the ground and then moved rapidly along the runway and after a long run it stopped safely.
选项 A、as
B、unless
C、while
D、so
答案A
解析 注意本处的意思为“当……时候”。A选项as与C选项while的意思都是“当……时候”，但as指一个较长的时间过程，而while指事情发生的一刻。由于飞机降落触地滑行有一个过程，此处应选择as。
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