．（山东卷28）. 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 |
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．（山东卷28）. 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 |
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