参考答案：D

解析：结构识别。accord一致，调和，符合，in full accord完全一致；unanimous意见一致的，无异议的：He was elected with unanimous approval．他以全体一致同意而中选。indecisive非决定性的：an indecisive contest非决定性的竞赛。sullen愠怒的，沉闷不乐的：a sullen face愠怒的面容。vocal发嗓音的，声音的，有声的，歌唱的：He became vocal with indignation．他因愤慨而发言。