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You will not be allowed to get into the plane_______ you pass security checks(安检).
A.ifB.unlessC.orD.because
B

试题分析:句意:如果你不通过安检,你将不被允许上飞机。A if 如果 B. unless 如果不C. or 否则 D. because因为,根据句意,故选B。
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