问题
选择题
—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
答案：C
分析forget doing sth. 意为“忘了曾经做过某事”，forget to do sth. 意为“忘记去做某事”。
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