Question

【题目】_____his telephone number or e-mail address, she had some difficulty getting in touch with John.

A. Not knowing B. Not to know

C. Not known D. Not having known

Answer 1

【答案】A

【解析】考查非谓语动词。Not knowing…为现在分词的否定形式，在句中作原因状语，含伴随状况，相当于Because she didn't know his telephone number。