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【题目】Passengers must not leave their seats ________ the plane comes to a full stop.

A. until

B. since

C. if

D. because

【答案】A

【解析】句意:在飞机完全停止之前,乘客不得离开座位。A) until直到,在…以前,短语not…until…:直到…才…;B) since自从…以来,既然; C) if如果,是否;D) because因为。结合句意和语境可知选A。

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