After struggling against the stronger U.S. dollar for much of the day, wheat futures rebounded, shored up in part by advances in the corn and soybean markets and better-than-expected export sales of the crop. The USDA on Thursday said private exporters in the week ended Feb. 19 sold 459k mt of wheat, up 23% from a week earlier. Analysts had projected export sales of 150k-425k mt. March wheat added 5 1/2 cents, or 1.1%, to $5.03 1/4 a bushel.