【題目】I rememberedthe 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

【答案】B
【解析】句意：我記得離開辦公室前要鎖門的，但是卻忘記了要關燈。A、C、D三個選項都表示動作已經(jīng)完成。只有B選項表示尚未做。remember doing=remember having dong=remember to have done“忘記已經(jīng)做過的事，忘記做了某事”。故答案選B。

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