They need thirty minutes to clean their classroom.(对划线部分提问) (thirty minutes划线)

问题描述:

They need thirty minutes to clean their classroom.(对划线部分提问) (thirty minutes划线)
____ ____time do they need to clean their classroom?

【How much 】time do they need to clean their classroom?
不明白的再问哟,请及时采纳,多谢!