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Students are often warned that anyone who leaves the classroom at night must remember to _____ all the lights, or he will be fined.
A.switch off B.go offC.take offD.bring off
A
短语辨析。switch off关闭;go off   响起,变质;take off脱下,飞机起飞;bring off救出,成功完成。句意:学生们被警告任何人晚上离开教室时必须记得关掉所有的灯,否则他会被罚款。所以选A。
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