问题
选择题
The school rules state that no child shall be allowed out of the school during the day, _____ accompanied
by an adult. [ ]
A. once
B. when
C. if
D. unless
答案
答案：D
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The school rules state that no child shall be allowed out of the school during the day, _____ accompanied
by an adult. [ ]
A. once
B. when
C. if
D. unless
答案：D