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sit 与seated的区别

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sit 与seated的区别
----when did the lecture begin?
-----when all the students______,the professor began his lecture.
A.seated B were sitting C.were seated.D.seat
这题为什么不选B ,而选C?
sit 是动词,坐下的意思
seat是名词,座位的意思
所以应该是当学生全部“坐下”时,教授才开始讲课