分类：教育/科学-外语学习
问题：英语非诚勿扰Whenallthosepresent（到场者）__ 
 When all the present（到场者）________ he began his lecture. A.  sit B.  set C.  seated D.  were seated
回答：When all those present（到场者）____D____ he began his lecture. 
当所有的到场者都就坐了，他开始了他的演讲。
seat是及物动词，使…就坐。这里是它的被动语态，即到场者被安排就坐了。