his telephone number, she had some difficulty getting in touch with Bill.
A. Not knowing
B. Knowing not
C. Not having known
D. Having not known
网友回答
(答案→)A. Not knowing
B. Knowing not
C. Not having known
D. Having not known
解析：考查非谓语动词。逻辑主语she，与know之间为主动关系，用现在分词，否定用在分词之前。句意：不知道他的电话号码，她很难与比尔取得联系。