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问题: 一道英语题

___ in thought,Tom was almost knocked down by a passing bus.
A.Lost B.Be lost C.Losing D.Having lost
答案选A,我觉得是C,后面有Tom是动作的发出者啊,为什么啊?

解答:

lost in thought 陷入沉思,表示的是Tom的状态,用lost


having done表示该动作先于后一情况发生