________ in thought, he almost ran into the car in front of him.
A.Losing
B.Having lost
C.Lost
D.To lose
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正确答案： C 答案分析： 这里分词短语的意义应为“ As he was lost in thought”，意为“由于陷入沉思”，这儿填入过去分词短语，表示一种状态，用作原因状语。
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