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英语
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( )his telephone number, the manager had some difficulty getting in touch with the clerk.
a.Not knowing
b.Knowing not
c.Not having known
d.Having not known
这道题选哪个,选它的原因是什么,谢谢~
人气：340 ℃ 时间：2020-03-29 22:52:32
解答
A.表原因,没必要用完成式
bd形式不对.
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