do you know who the clock___?(belong to/does belong to/is it belong /does it belong)

问题描述:

do you know who the clock___?(belong to/does belong to/is it belong /does it belong)
belongs to

应填belongs to为什么 为什么这是个宾语从句, 要用陈述语序,也就是连接词who+主语 the clock +谓语belongs to 是谓语动词