What are they busy 后用加doing吗?（Wat are they busy doing?)
What are they busy 后用加doing吗?（Wat are they busy doing?)
英语人气：627 ℃时间：2019-08-20 09:10:51
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应该What are they busy on doing sth那They are busy harvesting对harvesting划线提问，应该怎么问What are they busy on?
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