问题详情：
改错：(2018·*苏高考)When a darkcolored cake was served on a black plate rather than a white one, customers recognize it as sweeter and more tasty.
________________________________________________________________________
【回答】
recognize→recognized 根据前面的从句中谓语动词“was served”可知，主句中的时态也应该为一般过去时，故将recognize改为recognized。
知识点：一般过去时及其被动式
题型：短文改错
