A.T. Robertson Commentary Mark 12:23

"In the resurrection whose wife shall she be of them? for the seven had her to wife." — Mark 12:23 (ASV)

To wife (γυναικα). Predicate accusative in apposition with "her" (αυτην). So Luke, but Matthew merely has "had her" (εσχον αυτην), constative aorist indicative active.