24. You ought to have put the milk in the refrigerator, and now ________sour.
A．it smellB．it is smeltC．it smellsD．it is smelling
C
考查時(shí)態(tài)。句意：你應(yīng)該已經(jīng)把牛奶放進(jìn)冰箱了，可是現(xiàn)在聞起來酸了吧！結(jié)合語境可知下文描述的是現(xiàn)在客觀存在的狀態(tài)，故用一般現(xiàn)在時(shí)態(tài)，選C。
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