( )where to go,the old man turned to a policeman for help.A ,Having lost his way and not kmowing B ,Losing his way and didn't know C ,Lost his way and not knowing D ,Lost his way and didn't know选A,请问下为什么?

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( )where to go,the old man turned to a policeman for help.A ,Having lost his way and not kmowing B ,Losing his way and didn't know C ,Lost his way and not knowing D ,Lost his way and didn't know选A,请问下为什么?

( )where to go,the old man turned to a policeman for help.A ,Having lost his way and not kmowing B ,Losing his way and didn't know C ,Lost his way and not knowing D ,Lost his way and didn't know选A,请问下为什么?
( )where to go,the old man turned to a policeman for help.
A ,Having lost his way and not kmowing
B ,Losing his way and didn't know
C ,Lost his way and not knowing
D ,Lost his way and didn't know
选A,请问下为什么?

( )where to go,the old man turned to a policeman for help.A ,Having lost his way and not kmowing B ,Losing his way and didn't know C ,Lost his way and not knowing D ,Lost his way and didn't know选A,请问下为什么?
这样的,having done为现在分词的完成式,作状语表示该动作的发生早于主句the old man turned to a policeman for help动作的发生时间.而后面是现在分词的一般式作伴随,否定形式在doing前加not.整句话是说,迷路后那个老人不知道往哪去,他向警察求助.

你好。这是分词结构作伴随动作。完全可以改为时间状语从句:When the old had lost his way and didn't know where to go,he turned to a policeman for help. 又如:
Living here, Tom has many friends -----------Tom lives here and has many friends

A.主语发出动作,分词的动作先于谓语的动作,所以用完成形式