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简单英语!————not his address,i couldn‘t get in touch with him.A,

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简单英语!
————not his address,i couldn‘t get in touch with him.
A,not knowing
B,having not know

谢谢,详解!
简单英语!————not his address,i couldn‘t get in touch with him.A,
应该选择A.
这是一个非谓语动词结构,用现在分词作原因状语,并且用否定式,现在分词的否定式用not加现在分词构成.
希望能帮助你解疑释惑.