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 考点:本题考查省略的状语从句的连接词. 解析: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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