in thought, he didn't notice his teacher coming into the classroom at all. [ ]A.
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![in thought, he didn't notice his teacher coming into the classroom at all. [ ]A.](/pic/43_616159.jpg)
_____ in thought, he didn't notice his teacher coming into the classroom at all. [ ]A. Losing
B. Having lost
C. Lost
D. To lose
试题答案
C