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    精英家教网 > 高中英语 > 题目详情
    The school rules state that no child shall be allowed out of the school during the day, __________ accompanied by an adult.
    A．onceB．whenC．ifD．unless
    D
    连词题once一旦；  when当…时候； if如果； unless除非。“学校规定白天学生不准外出除非有成人陪伴。”答案为D。
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