Topic: Right Form of Verb,

Best Answer Explained in Below-:

The sentence "Jack - television a lot, but he doesn’t any more." requires a form of the verb that conveys a past habit or state that no longer exists. The correct choice, "C) used to watch," fits this context perfectly.

Here’s why:

1. **Used to**: This phrase explicitly indicates that an action (in this case, watching television) was a regular occurrence in the past but is not in practice anymore. It highlights a change from the past to the present.

2. **Grammatical Structure**: The phrase "used to" is followed by the base form of a verb, which aligns with the structure of the sentence you're trying to complete. In this case, "watch" is in its base form.

3. **Meaning**: While "was watching" (Option A) implies a continuous action in the past, it does not indicate that Jack has stopped the action. "Was used to watch" (Option B) is grammatically incorrect, as "used to" cannot be partnered with "was" in this context. "Had used watching" (Option D) is also incorrect and awkward.

In summary, "used to watch" effectively communicates that Jack regularly watched television in the past but has since stopped, fitting seamlessly into the sentence structure and meaning.