_in the conversation,they didn`t notice me entering the room.A.EngagedC.Engaged themselvesD.Having engaged themselves

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_in the conversation,they didn`t notice me entering the room.A.EngagedC.Engaged themselvesD.Having engaged themselves

_in the conversation,they didn`t notice me entering the room.A.EngagedC.Engaged themselvesD.Having engaged themselves
_in the conversation,they didn`t notice me entering the room.
A.EngagedC.Engaged themselvesD.Having engaged themselves

_in the conversation,they didn`t notice me entering the room.A.EngagedC.Engaged themselvesD.Having engaged themselves
这道题包含两个知识点:1一个词组 sb be engaged in doing 是忙于做某事
2 句子前后部分 主语一致 ,可用省略结构:这句话完整的是they were engaged in the conversation ,so they didnt notice me entering the room
很明显,前后的 主语都是they 就可以省略以主语和其谓语动词