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23.___________ what to do,he decided to go to Mr Black for help.A.Not knowing B.Not having kno

分类: 作业答案 • 2021-11-20 09:56:08

问题描述：

23.___________ what to do,he decided to go to Mr Black for help.A.Not knowing B.Not having kno

答

nothaveingknown 从decided可以看出这是一个过去完成进行时