问题补充:
—Is Bob still performing?
—Im afraid not.He is said the stage already as he has become an official.
A. to have left
B. to leave
C. to have been left
D. to be left
答案:
(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。
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