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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
短語辨析。switch off關閉；go off   響起，變質；take off脫下，飛機起飛；bring off救出，成功完成。句意：學生們被警告任何人晚上離開教室時必須記得關掉所有的燈，否則他會被罰款。所以選A。
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