题目内容：

a number of 和 plenty of 有什么区别?

优质解答

a number of +名词复数,"许多,一些",作主语时,谓动用复数.plenty of +可名复,"大量的,足够的" ,作主语时,谓动用复数.plenty of +不可名,"大量的,足够的" ,作主语时,谓动用单三如:A number of new products have been...