下述用词或表述哪个正式程度较高，更适合书面语： A: suppose：v. 假定；比方说；假设； Supposeyou were buying a new car, would your discussion begin and end with the monthly payment? 假定你要买辆新车，你开始和结束讨论时的问题会是按月付款的数额吗？ B: say：v. 假定；比方说；假设 Say you were buying a new car, would your discussion begin and end with the monthly payment? 假定你要买辆新车，你开始和结束讨论时的问题会是按月付款的数额吗？