Question

【题目】— The light in the office is still on.
— Oh, I forgot ______.
A.turning it off
B.turn it off
C.turned it off
D.to turn it off

Answer 1

【答案】D
【解析】句意：—办公室里的等还在亮着。—哦，我忘记关了。forget to do sth忘记做某事（表示某事没做）；forget doing sth忘了做过某事（已经做过），灯亮着，所以没有关，故用不定式，故选D。