--Excuse me but could I use your mobile phone for a while? -------. I’m not using

问题补充：

------- Excuse me, but could I use your mobile phone for a while?

-------. I’m not using it myself now.

A. Never mind

B. Of course, you could

C. That’s all right

D. At your service

答案：

A. Never mind

B. Of course, you could

C. That’s all right

(答案→)D. At your service

解析：考查交际用语。结合句意可知D正确。—我可以用一下你的手机吗？—随便你，我现在不用。