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15.Students are not allowed to leave the class early without the teacher's permission.

分析 未经老师的许可学生不允许提早离开课堂.

解答 答案是permission.本题考查语境中选用恰当的词或短语的适当形式.permission n.许可; without permission 未经许可;故答案是permission.

点评 首字母填空必须在对语境整体理解的基础上抓住指向答案的关键线索、固定句型或搭配等,结合首字母选用恰当的词,同时注意所选词的形式变化.

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