She felt of having asked such a silly question when the audience couldn't help laughing.

网友回答

A. guilty
B. crazy
C. miserable
(答案→)D. ashamed
解析：　be ashamed of因......感到羞耻，惭愧：1)He is ashamed of what he was done.2)She felt ashamed of having done so little.(=She felt ashamed that she had done so little.) 3)John was ashamed to ask for help.(他不好意思向人求助。) 4)Jim was ashamed to have troubled me with so many questions.Be guilty of犯有......罪，过失：1)He was found guilty. 2)I am not guilty of this crime.