对划线部分提问 This is jack.(jack为划线部分)This is jack.(jack为划线部分)_____ ______this?

问题描述:

对划线部分提问 This is jack.(jack为划线部分)
This is jack.(jack为划线部分)_____ ______this?

What is this

This is jack.(jack为划线部分)【Who is】this?