These boys are singing in the hall.(对These boys 提问)

问题描述:

These boys are singing in the hall.(对These boys 提问)

Who is singing in the hall?
解释:在当时情况下我们不知道有多少人,可以是一个人也可以是一群,所以通使用“is”
望采纳~O(∩_∩)O谢谢