friut is cheapest ( ) season.A:at B: on C:in D:through 本来我是选C的,但是沪江网上的答案是A,我觉得很奇怪,不是时令水果最便宜吗?怎么用at 介词呢?It's cheaper to buy fruit and vegetabes that are in season.这可是字典里的。意思是:购买当令水果和蔬菜比较便宜。怎么会没有in season 这样的说话呢?