Why don't you put the meat in the fridge?It will ____ fresh for several days.
A.be stayed B.stay C. be staying D. have stayed
答案是stay。知道stay在此是系动词，无进行时态和被动语态。但stay是延续性动词后面可以接段时间，为什么have stayed不可以？仅仅是因为意思上不对还是语法上有问题？
该问题是否可以转变为“一般将来时will do和将来完成时will have done的区别”？