The school rules state that no child shall be allowed out of the school during the day, a

发布时间：2020-08-16 11:36:14


The school rules state that no child shall be allowed out of the school during the day,      acpanied by an adult.
A. once
B. when
C. if
D. unless

网友回答

A. once
B. when
C. if
(答案→)D. unless
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