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The light in the office is still on. ---- Oh,I forgot___. A.

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The light in the office is still on. ---- Oh,I forgot___. A. turning it off B. turn
选哪个 说明理由
---- The light in the office is still on.
---- Oh,I forgot___.
A. turning it off B. turn it off C. to turn it off D. having turned it off
典型例题
---- The light in the office is still on.
---- Oh,I forgot___.
A.turning it off B.turn it off C.to turn it off D.having turned it off
答案:C.由the light is still on 可知灯亮着,即关灯的动作没有发生,因此用forget to do sth.
而forget doing sth表示灯已经关上了,而自己忘记了这一事实.此处不符合题意.