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  3. ________his grandma before, he didn’t know she was his grandma at first.

________his grandma before, he didn’t know she was his grandma at first.

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问题 ________his grandma before, he didn’t know she was his grandma at first.
选项 A、Not being seen
B、Not having seen
C、Having not seen
D、Not seeing
答案B
解析 分析句子结构可知，空处应用非谓语动词，逗号前的内容在句中作状语。see和he之间是逻辑上的主谓关系，因此应用现在分词。且根据句意和句中的时间状语before!可知，see表示的动作先于don’t know表示的动作，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式是在其前直接加not。故选B。
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