Concept:The pattern "It is about time..." requires a past simple verb even though the meaning refers to the present or immediate future.
Explanation:The sentence is: "It is about time you ______ to bed."
This structure is used to express annoyance or a strong suggestion about something that should happen now.
After "It is about time", English grammar requires the past simple tense.
The base verb is "go", so its past simple form is "went".
"go" is the present simple, "have gone" is present perfect, and "should go" does not follow the required pattern.
Therefore, the best word to complete the sentence is "went".
The correct sentence is: "It is about time you went to bed."
Answer:C. went