the classroom, the teacher found all the parents already there.A. Entered; seatedB. Ente

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A. Entered; seated
B. Entering; seating
C. Entered; seating
(答案→)D. Entering; seated
解析：考查非谓语动词。第一空主语the teacher与Enter之间是主动关系，故用现在分词作状语，第二空考查过去分词作宾补，结构为find sth done，句意：这位老师进入教室，发现所有的老师已经坐在那了。所以选D。