The food that you bought yesterday should be eaten ________．It may go bad if you don't．
A.as fast as possibleB.as quickly as you canC.as soon as possibleD.so soon as you can在线课程C
解析：
eat food是从时间的长短上来说，而不是从速度上说的，而as soon as possible／one can是从时间段上讲的。