Topic: Right Form of Verb,

Best Answer Explained in Below-:

The sentence "I wanted to stop — some present, but we didn’t have enough time." requires a gerund form to convey the speaker's intent clearly. The structure aligns with the phrase "wanted to stop," which typically precedes an activity or action that they aimed to cease.

In this context, "buying" serves as the gerund that fits seamlessly after "stop," creating the complete thought: "I wanted to stop buying." The gerund "buying" captures the ongoing action of purchasing, indicating that the speaker refers to the act of acquiring items.

The other options fail to maintain the necessary grammatical structure:
- **A) buy**: This is an infinitive, which would not fit grammatically after "stop."
- **C) being bought**: This presents a passive construction that does not align with the speaker's intention of ceasing an activity.
- **D) bought**: This past participle does not convey an ongoing process, which is essential here.

Thus, "buying" is the correct answer as it correctly transforms the intended action into the gerund form that coherently completes the speaker's sentiment about wanting to cease purchasing.