10 I have worked as a teacher since I... from the 10 university. graduated graduating graduate have graduated

The correct answer is **A. graduated**.The sentence should read: "I have worked as a teacher since I graduated from the university."The other options are incorrect because:* **graduating:** This is a gerund (verb acting as a noun) and doesn't fit the grammatical structure of the sentence. The sentence needs a past tense verb to indicate the completed action of graduation.* **graduate:** This is the present tense form of the verb and doesn't indicate a completed action in the past.* **have graduated:** This is the present perfect tense, which implies the graduation is still relevant to the present. While not grammatically impossible, it's less natural than the simple past tense in this context. The simple past tense ("graduated") clearly indicates a completed action that occurred *before* the start of the teaching career.