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

Question

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

Answer 1

正确答案：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。