Question

are usually go to school at seven thirty对划线部分进行提问

They usually go to school at seven thirty． （就句子画线部分提问）
___ do they usually go to school？

Answer 1

答案：What time．
划线部分为原来陈述句的时间状语，表示具体时间，用疑问词"what time"进行提问，疑问词后面跟一般疑问句，故答案是 What time