问题补充：
—Can I help you, sir? —.
A. Yes, you can help me
B. No, I don’t need any help
C. Of course, if you like
D. No, thanks, I’m being served
答案：
A. Yes, you can help me
B. No, I don’t need any help
C. Of course, if you like
(答案→)D. No, thanks, I’m being served
解析：在英文中对于别人提供的帮助，如果我们不需要我们可以说不，谢谢，也就是no，thanks，故本题选D。
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