e busy doing stn 是be busy (in) doing sth 的省略.be busy (in) doing sth 忙于做某事.doing是动词的ing 形式,是动名词.与be busy in sth是一样的.in doing sth 介词短语,做句子的状语,表原因.Now they are busy ...
请教句子成分 Now they are busy preparing their lesson.
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