Children in China start school at 6 years old.划线部分是at 6 years old,对划线部分提问____ _____children in China start school?

问题描述:

Children in China start school at 6 years old.
划线部分是at 6 years old,对划线部分提问____ _____children in China start school?

大意:孩子们在中国6岁开始上学
Which country.......? 哪个学校?

孩子在中国上了多少书 what are