问题 选择题

24. You ought to have put the milk in the refrigerator, and now ________sour.

A.it smell

B.it is smelt

C.it smells

D.it is smelling

答案

答案:C

考查时态。句意:你应该已经把牛奶放进冰箱了,可是现在闻起来酸了吧!结合语境可知下文描述的是现在客观存在的状态,故用一般现在时态,选C。

单项选择题
单项选择题