a series of books后面为什么接is a number of books 后面为什么接are,

a series of books后面为什么接is a number of books 后面为什么接are, a series of books 后面加is 还是 are? the number of books is 20,为什么不是are a large number of people后面为什么用are a series of books翻译成中文 there are a large number of.为什么用ARE后面不是A吗 a small number of students后面用is 还是are? I’m sorry,a number of books A.is lost B.is missing C.are mis the number of books is 20.book不是可数名词吗,为什么用is不用are there are a l什么number of books there There _____ (is/are )a box of rubbers near the books.为什么? chinese is spoken by a large number of people 为什么spoken后面要加i