题目

__________   in thought,he almost ran into the car in front of him. A.Losing                B.Having C.Lost                  D.To lost   答案： C 陷入沉思为“be lost in thought”。lost相当于形容词，说明主语的状态，可以直接作状语，省略动词be。类似的结构有：(be)dressed in（穿着）；(be) located in（位于）；(be) based on（以……为基础）等。  

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