Took the left one until about 200 ft when it became apparent that the r/w was much narrower than the right hand one. Doubts, then certainty - it was the taxiway. Just time to switch (B757) and land.
Many years ago, you might even get a pat on the back for a good bit of handling - today you would be severely chastised for not going around for a second approach rather than repositioning an airliner onto a different runway at less than 200 feet.
