Using a modal auxiliary:You had better get some professional adv

Using a modal auxiliary:
You had better get some professional advice before you buy stocks.
【正确答案】：You should get some professional advice before you buy stocks.
【题目解析】：Had better用于建议、警告、威胁、发表意见等，意为“最好”；可以用 should和ought to代替，表示应该做某事，不过常用should。