题干

如图, △ABC中, AB =" AC," E在BC上, D在AE上. 则下列说法中正确的有( )
①若E为BC中点, 则有BD = CD;   ②若BD =" CD," 则E为BC中点;
③若AE⊥BC, 则有BD = CD; ④若BD =" CD," 则AE⊥BC.  

A. ①③④    B. ②③④    C. ①②③    D. ①②③④
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