The girls were bought shops,为什么用bought,而不是buying

The girls were bought shops,为什么用bought,而不是buying
原文是这样的A poor boy became a rich and famous singer.He married and had two sons and two daughters.One day he said to his wife,“Our children mustn't have a hard life as we had.We must help them more than our parents helped us.” The wife agreed.So the parents sent their children to fine schools.They enjoyed expensive sports.They were given everything in life except this:they were not taught how to work.Later the parents bought businesses for their children.The sons,at 21,became the owners of banks.The girls were （bought ) shops.But soon all these businesses failed because the young owners knew nothing of business or of work.括号里的为什么用bought,而不是buying