Question

— Look, the light in the living room is still on.
—Oh, I forgot _______.

A．turning it off

B．turn it off

C．to turn it off

D．having turned it off

Answer 1

C

试题分析：句意：——看，客厅里的灯还亮着。——哦，我忘了关灯。forget doing sth.对做过的事忘记了。forget to do sth.忘了去做某事。根据the light in the living room is still on.可知灯还亮着，因此忘了去关灯。
故选C。