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题目
题型:不详难度:来源:
The school rules state that no child shall be allowed out of the school during the day, __________ accompanied by an adult.
A.onceB.whenC.ifD.unless

答案
D
解析
连词题once一旦;  when当…时候; if如果; unless除非。“学校规定白天学生不准外出除非有成人陪伴。”答案为D。
核心考点
试题【The school rules state that no child shall be allowed out of the school during t】;主要考察你对连词等知识点的理解。[详细]
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