. Select the most appropriate option that can underline segment in the given sentence. If there is no need to substitute it, select ‘No improvement required’. Hardly had we get in but the train started.

Correct answer: . we got in when

Explanation: The correct answer is D. Option Analysis: ❌ A. we get in than : Wrong verb tense ("get"), and incorrect connector ("than" should be "when"). ❌ B. No improvement required : Original sentence contains errors in verb tense and conjunction. ❌ C. we got in before : "Before" is not the correct conjunction in the standard "Hardly... when..." structure. ✅ D. we got in when : Correct verb form and correct conjunction. Matches the required grammatical structure. Correct Sentence- "Hardly had we got in when the train started."