单选题 It's a long time since he left his hometown, ______?
A. didn't he B. hadn't he
C. wasn't it D. isn't it

【正确答案】 D
【答案解析】解析：本题考查的是反义疑问句的用法。肯定句的反义疑问应为否定形式，谓语与其主句保持一致。本句意为：他离开家乡已经有很长一段时间了，对吗?故本题答案为D。