—The light in the office is still on. —Oh, ! forgot

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问题 —The light in the office is still on.      —Oh, !  forgot

选项 A、turning it off
B、turn it off
C、to turn it off
D、having turned it off

答案C

解析 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。
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