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

試題分析：句意：如果你不通過安檢，你將不被允許上飛機(jī)。A if 如果 B. unless 如果不C. or 否則 D. because因?yàn)�，根�?jù)句意，故選B。
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