She asked me which one I'd like, and I said I didn't mind.
她问我要哪一个,我说哪一个都没有关系。[动词时态一致,这是中国人学习英语最头痛的一个问题。]
After a little time, she chose one of the most expensive dresses in the shop and handed it to an assistant who wrapped it up for her as quickly as possible.
过了一会儿,她又选了商场里最昂贵的一件衣服,把它递给了售货员。那售货员以最快的速度为她包好了衣服。