I remembered the door before I left the office but forgot to turn off the lights.A. lockin

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A. locking
B. having locked
C. to have locked
(答案→)D. to lock
解析：句意为：离开 办公室前我记着要去锁门，却忘了关灯。 remember/forget to do sth.记得 /忘记去做某事； remember/forget doing sth.记得 /忘记曾经做过某事。选D。