问题标题:
【_intheconversation,theydidn`tnoticemeenteringtheroom.A.EngagedC.EngagedthemselvesD.Havingengagedthemselves】
问题描述:

_intheconversation,theydidn`tnoticemeenteringtheroom.

A.EngagedC.EngagedthemselvesD.Havingengagedthemselves

曹海鑫回答:
  这道题包含两个知识点:1一个词组sbbeengagedindoing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theywereengagedintheconversation,sotheydidntnoticemeenteringtheroom   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
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