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—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

--- 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

---- 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

—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

---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 turning it off