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：考查不定式做宾语，remember to do记得去做…,remember doing记得做过…，句意：我记得离开办公室要锁门，但忘了关灯。选B。