精英家教網 > 高中英語 > 題目詳情
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
連詞題once一旦；  when當…時候； if如果； unless除非�！皩W校規(guī)定白天學生不準外出除非有成人陪伴�！贝鸢笧镈。
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