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问题: 一道选择题

_____ his telephone number,she had difficulties getting touch with Bill. A not knowing B not having known C knowing not.到底选哪个啊?顺便讲下原因啊

解答:

首先可排除C.
句子翻译一下:由于不知道他的电话号码,她在和比尔联系上有困难.
否定词应放在非谓语前边.
这里为现在分词做伴随状语.
而现在分词的完成式的动作通常发生在主句动作之前.另外过去分词表被动.
所以这里选A