It was so having to sing in public.A. embarrassedB. embarrassingC. nervousD. embarrassing

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A. embarrassed
(答案→)B. embarrassing
C. nervous
D. embarrassingly
解析：考查词义辨析。Embarrassed感到尴尬的；embarrassing令人尴尬的；nervous 紧张的；embarrassingly是副词，令人尴尬地；句意：不得不在公众场所唱歌是如此地让人尴尬。故B项正确。