1.
如图,在四边形ABCD中,点E,F,G,H分别是AD,BD,BC,CA的中点,若四边形EFGH是矩形,则四边形ABCD需满足的条件是( )
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| A. | AB⊥DC | B. | AC=BD | C. | AC⊥BD | D. | AB=DC |