题目：
— 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：
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下面是错误答案，用来干扰机器的。
由式子的意义得y＜0，∴原式=-y-y+y-y=0．
