a variety of和 varieties of后面谓语用单数还是复数
问题描述：
a variety of和 varieties of后面谓语用单数还是复数
我问的不是名词但是还是复数，是后面的谓语用什么形式
答
For example:1.There is a variety of books to choose from.2.Varieties of books are being sold at this bookshop.如果是a variety of谓语动词用单数.如果是varieties of谓语动词用复数.