作业帮23.___________ what to do,he decided to go to Mr Black for help.A.Not knowing B.Not having kno
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23.___________ what to do,he decided to go to Mr Black for help.A.Not knowing B.Not having kno
23.___________ what to do,he decided to go to Mr Black for help.A.Not knowing B.Not having kno
23.___________ what to do,he decided to go to Mr Black for help.A.Not knowing B.Not having kno
not haveing known 从decided可以看出这是一个过去完成进行时