【Whataretheybusy后用加doing吗?（Wataretheybusydoing?)】
2022-01-22 72次 反馈错误 加入收藏 正确率 : 100%
题目内容：
What are they busy 后用加doing吗?（Wat are they busy doing?)
优质解答
应该What are they busy on doing sth - 追问：
- 那They are busy harvesting对harvesting划线提问，应该怎么问
- 追答：
- What are they busy on?
本题链接：
