---Thelightintheofficeisstillon.  ---Oh,Iforgot

問題詳情：

 --- 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

【回答】

C

知識點：非謂語動詞

題型：選擇題