My mother drank some milk last night.要求按划线部分提问,划线部分是some milk.怎么写?

What did your mother drink last night?为什么这么写？特殊疑问句的构成： 1．如疑问词作其他成分，即对其他成分提问，其语序是：疑问词＋一般疑问句语序？ 如：What class are you in？What does she look like？Where are you from？What time does he get up every morning？How do you know？ 2．如疑问词作主语或主语的定语，即对主语或主语的定语提问，其语序是陈述句的语序：疑问词（＋主语）＋谓语动词＋其他成分？如：Who is singing in the room？Whose bike is broken？