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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【C1】______the passengers had fastened their seat belts, they were suddenly【C2】______forward. At that moment, the air—hostess【C3】______She looked very pale, but was quite【C4】______. Speaking quickly but almost in a whisper, she【C5】______everyone that the pilot had【C6】______and asked if any of the passengers knew anything about machines or at【C7】______how to drive a car. After a moment’s【C8】______, a man got up and followed the pilot’s cabin. Moving the pilot【C9】______, the man took his seat and listened carefully to the【C10】______instructions that were being sent by radio from the airport【C11】______The plane was now dangerously close【C12】______the ground, but to everyone’s【C13】______, it soon began to climb. The man had to【C14】______the airport several times become【C15】______with the controls of the plane.【C16】______the danger had not yet passed. The terrible【C17】______came when he had to land. Following【C18】______, the man guided the plane toward the airfield. It shook violently【C19】______it touched the ground and then moved rapidly【C20】______the runway and after a long run it stopped safely.
【C19】
选项 A、as
B、unless
C、while
D、so
答案A
解析 as当……的时候，符合句意。unless除非。while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因此，表结果，不符合句意。
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