—Is Bob still performing?—Im afraid not.He is said the stage already as he has become a

网友回答

(答案→)A. to have left
B. to leave
C. to have been left
D. to be left
解析：此题考查学生对动词不定式的时态和语态的掌握和运用能力。首先leave作“离开” 讲时是不及物动词，没有被动形式；其次，句中的already 表示完成概念。因此选择表示主动兼完成的to have left。