单选题 As a composer, pianist, and band leader, Duke Ellington was a key figure in the history of jazz (爵士) .
A. lonely B. important C. musical D. royal

【正确答案】 B
【答案解析】[解析] key意为“关键的”，lonely意为“孤单的”，important意为“重要的”，musical意为“音乐的”，royal意为“皇家的”。故正确选项为B。