问题补充：
——Could I borrow your camera?
——，but please give it back by Saturday.
A. I am sorry
B. Of course
C. Certainly not
D. No, thanks
答案：
A. I am sorry
(答案→)B. Of course
C. Certainly not
D. No, thanks
解析：I am sorry 抱歉；Of course当然了；Certainly not当然不了；No, thanks不，谢谢。句意：我能借你的照相机吗？——当然了，但是请在星期六之前还给我。英语情景交际回答时一般要遵从以下几个原则：礼貌原则，利他原则和英语文化习惯。结合语境可知选B。
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