I didn’t . . . . . . . . TV last night? A. not watched B. watched C. watch D. watching

The correct answer is A. not watched.

The sentence is in the negative, so we need to use a past participle. The past participle of “watch” is “watched.”

The other options are incorrect because they are not past participles.

• “Watched” is the past tense of “watch.” It is used to describe an action that happened in the past.
• “Watch” is the infinitive form of “watch.” It is used to describe an action that is happening or will happen in the future.
• “Watching” is the present participle of “watch.” It is used to describe an action that is happening now.