When all those present(到场者)__ he began his lecture.A.sit B.set C.seated D.were seaed
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解答
D were seated A sit 是不及物动词.这里是不是该用 sit down B set 作动词时是放置物品或是某物,某人处于某种状态,没有就座的意思. C seat 的特点是作动词时为及物动词,后面必须有宾语或用其被动语态 如:Be seated,please.请坐.(很礼貌的用法) seat sb.某人就座(有安排,使的意味 ) seat yourself ,seat him