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> ________hergrandmabefore,hedidn’tknowshewashisgrandmaev...

问题详情：

________her grandma before, he didn’t know she was his grandma even if his mother had told him.（）

A．Not being seen	B．Not having seen
C．Having not seen	D．Not seeing

【回答】

知识点：动词时态与语态

题型：选择题

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