what interests the visitors most -----the large number of bookshops答案到底是is还是 are,为什么.the large nuber of 是数目还是许多啊,

what interests the visitors most -----the large number of bookshops答案到底是is还是 are,为什么.the large nuber of 是数目还是许多啊,
what interests the visitors most -----the large number of bookshops
答案到底是is还是 are,为什么.the large nuber of 是数目还是许多啊,

what interests the visitors most -----the large number of bookshops答案到底是is还是 are,为什么.the large nuber of 是数目还是许多啊,
用is [本句的主语是名词性从句“what interests the visitors most（最使游客感兴趣的）”],做单数.
另外,the number of 表示“……的数量”
a number of表示“许多”

答案是is 在这里what interests the visitors most做主语
所以用is