6._____his grandma before, he didn't know she was his grandma at first sight.
答案解析
解析：
分析句子结构可知,空处应用非谓语动词。see 和he 之间是逻辑上的主谓关系,因此应用现在分词。但根据句中的时间状语 before 可知,see 表示的动作发生在didn’t know 所表示的动作之前,所以应用现在分词的完成式,即“having +过去分词”的形式。现在分词的完成式的否定形式是在其前直接加not。故选B。
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