问题补充：
—Hi, Tommy. Are you busy now?
—. I have done my work, and I’m going out for shopping.
A. Don’t mention it.
B. Nothing serious.
C. Never mind
D. Not really.
答案：
A. Don’t mention it.
B. Nothing serious.
C. Never mind
(答案→)D. Not really.
解析：四个选项的含义分别是：A. Don’t mention it.不用谢，B. Nothing serious.没什么严重的，
C. Never mind没关系，D. Not really.不是真的，句意：--你好，Tommy，你现在忙吗？--不是真的忙，我的工作做完了，正打算去购物。所以选D。
