分析一下这个句子的成分While building a much higher ground (with desks a
分析一下这个句子的成分
While building a much higher ground (with desks and chairs), I saw my teacher, Miss Smith, a young pretty lady, whose skirt was wet, was scooping up the rainwater from the floor and poured it outside the classroom.
While building a much higher ground (with desks and chairs)这里的主语如果要补充,该是那个?