________ the classroom, the teacher found all the parents already______ there.A.Entered; seatedB.Entering; seatingC.Entered; seatingD.Entering; seated
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D解析这题考查非谓语动词的用法，第一空填entering做时间状语，老师进入教室是主动的关系，所以用现在分词，第二空seated做宾语补足语，seat是“使…就坐”，the parents和seat是被动的关系，所以用find sb done结构，选D。