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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

时间：2022-01-01 11:38 关键词：

答案解析

D
本题考查省略的状语从句的连接词。句意应为“学校规章规定：除非有成年人陪同，否则孩子们在校期间不能出学校。”表示“除非”用unless。该句式构成了“连词+过去分词”结构。

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