(2012·安徽高考)I remembered the door before I left the office, but forgot to turn off the lights.
A. locking
B. to lock
C. having locked
D. to have locked
网友回答
A. locking
(答案→)B. to lock
C. having locked
D. to have locked
解析：选B 考查非谓语动词。句意：我离开办公室之前记得关门却忘记关灯了。remember to do sth.表示“记得要做某事”，与后半句中的“forgot to ...”相对应。