问题: 这里有几道单选，高考的，求解答
1：Please remain ___ until the plane has come to a complete stop.
A:to seat B:to be seated
C:seating D:seated
选什么，为什么？
2：The book was written in 1946,___ the education system has witnessed great changes.
A:when B:during which C :since then D:since when
选什么呢，为什么
解答:
1 保持,仍是[L]
This room remains cool all summer.
这个房间整个夏天保持凉爽。
She remained silent all night.
她整个晚上沉默不语。
留待,尚待[+to-v]
Several problems remain to be solved.
有好几个问题尚待解决。
seated adj
2 when 引导非限制性定语从句
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