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joinsbindoingsthin可以省略吗

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求教,忙于做某事,be busy in doing sth. in可以省略吗??_百度知道

2016年1月8日 - havedifficultyindoingsthin可以省略...42016-02-14.文库贴吧采购地图更多我要提问求教,忙于做某事,be busy in doing sth. in可以省略吗?? 我来答用户...
www.so.com/link?m=uh0x7WZM4cF66tJAKsq60sZ8ZJaW2Sjs...

中高考点易错点busy 用法,be busy in doing ,in常被省略 - 西瓜视频

busy 用法 Why are you so busy ? You are so busy. 主 系 副 表 (adj.) Busy adj. 忙碌的adv. busily 忙碌地 Be busy with sth 忙于某事 She is busy with her test. Be busy (in) doing sth...www.ixigua.com
www.so.com/link?m=wVbpH4b8qfDDItJim55qnCihRqC64%2F...

请问join in的宾语为什么省略了?The girl on the bus began to sing a ...

2017年9月22日 - 省略的应是her singing.前文提及,下文不说也明白,且不违反语法或其它规则的才可省略...
www.so.com/link?m=wXBqGTCb3y4mq%2Fw%2BQLSd8UFCpkmA...