The number of people who____ cars of their own is increasing

问题描述:

The number of people who____ cars of their own is increasing

have
虽然the number of ...后面的be动词是单数(题目里已经有了 :is increasing)
但是划线部分填的是who引导的定于从句,修饰people,所以划线部分填的应该是复数的