a set of 的意思是"一套,一组"所以后面接的名词一定是复数而对于它的谓语,因为是 a set 一套,所以用单数is如果是two sets of ,那么谓语就应该用are谓语是修饰主语的,......
series 用 are, is 都可以 set 用 are There are a set of rules There is a set of integers 用来修饰书就指一摞书，一套书......
