-The light in the office is still on. -Oh.I forgot . A. turning it off B. turn i

—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

试题答案

C。

解析:

表示忘记做某事，事情还没做，forget后接不定式。