Question

已知四边形ABCD的对角线相交于点O，下列条件不能判定四边形ABCD是平行四边形的是

1. A.
   OA＝OC，OB＝OD
2. B.
   ∠ABD＝∠BDC，∠CBD＝∠ADB
3. C.
   AB＝CD，OB＝OD，∠ABD＝∠BDC
4. D.
   OA＝OB，OC＝OD

Answer 1

D