__ his telephone number or e-mail address, she had some difficulty getting in to
题型：不详难度：来源：
__ 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 |
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答案
| A |
解析
| 本题考查非谓语动词。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。 |
举一反三
To learn the piece of music quickly, you"d better hear it ___ as many times as possible.| A．play | B．playing | C．played | D．to play |
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Only ______according to the directions can the medicine be quite effective.| A．taking | B．taken | C．being taken | D．having been taken |
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--- Why do you look sad?
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Many applicants stood outside the manager’s office, nervously waiting _________ for the job. | A．to choose | B．being chosen | C．choosing | D．to be chosen |
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Weather _________,the party will be held in the garden.| A．permitting | B．to permit | C．permitted | D．permit |
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