如图，四边形ABCD，AEFG都是正方形，点E，G分别在AB，AD上，连接FC，

如图，四边形ABCD，AEFG都是正方形，点E，G分别在AB，AD上，连接FC，过点E作EH∥FC交BC于点H.若AB＝4，AE＝1，则BH的长为(　　)

A．1 B．2

C． 3 D．3

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如图，四边形ABCD，AEFG都是正方形，点E，G分别在AB，AD上，连接FC，

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