____her address or telephone number,we couldn`t get in touch with her when we were on holiday空填Not knowing
问题描述：
____her address or telephone number,we couldn`t get in touch with her when we were on holiday
空填Not knowing
答
因为后面这句是一个完整的句子，如果前半句也是一个完整的句子，那两句之间一定要有连词，现在这句没有，所以前面半句一定不是完整的话，根据整句话的意思前面填not knowing，这个好像是独立主格结构
答
Not knowing her address or telephone number,=When we don't know her address or telephone number.是伴随状语.主语we在状语从句后面,用伴随形式形容主语,即用动词ing形式.