Students are often warned that anyone who leaves the classroom at night must remember to _____ all the lights, or he will be finedA.switch offB.go offC.take offD.bring off
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A解析短语辨析。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。