(2013·四川高考) which university to attend, the girl asked her teacher for advice.
A. Not knowing
B. Knowing not
C. Not known
D. Known not
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(答案→)A. Not knowing
B. Knowing not
C. Not known
D. Known not
解析：选A 考查非谓语动词。句意：由于不知道上哪所大学，那个女孩向她的老师征求意见。分析句子成分可知，the girl与know之间是逻辑上的主动关系，所以用现在分词作原因状语，且分词的否定式是在分词前加not，所以答案为A。