问题
选择题
_____ in thought, he didn't notice his teacher coming into the classroom at all. [ ]
A. Losing
B. Having lost
C. Lost
D. To lose
答案
答案：C
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_____ in thought, he didn't notice his teacher coming into the classroom at all. [ ]
A. Losing
B. Having lost
C. Lost
D. To lose
答案：C