题目内容

      how to solve the problem, the little boy turned to his father for help.
A.Not knowingB.Having not known
C.Not having been knownD.Not known
A
考查现在分词的否定做状语,句意是:不知道怎么解决问题,小男孩向父亲求助。The boy和know是主动关系,not发在现在分词前面。选A。
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