这几个词为什么要加sWhich seasons do you like best?The days are long a

这几个词为什么要加sWhich seasons do you like best?The days are long a Which seasons do you like best?中的season为什么后面要加S呢 ______ the four seasons,which season do you like best the days are long为什么要加S Which seasons do you like best in a year?Is your classroom b which do you like best?为什么best之前不加the? Which animal do you like best?为什么best的前面不加the which seasons do you like best（英译中） 为什么要加s?The days are long and the nights short.The sun rises Which do you like best?I like fruit best.两个best前需要加the吗? 是Which season do you like best?还是Which seasons do you like b Which do you like the best,这个“the"要不要加?并且说明原因谢谢.