·----the meeting room,he found all the parents already----there.----the meeting room,he found all the parents already----there.A.to enter sitting B.stepping into to seat C.entered seat D.entering seated 选什么?为什么?

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·----the meeting room,he found all the parents already----there.
----the meeting room,he found all the parents already----there.
A.to enter sitting B.stepping into to seat C.entered seat D.entering seated
选什么?为什么?

d,enter 的主语应该是人,所以用现在分词,stepto是步入,原文已经有了个already,故,我认为不用