1）All the students ( ),the report bagan.2) All the students

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1）All the students ( ),the report bagan.2) All the students ( ),and the report began.
1.) A.were seated B.seated C.were sitting D.sat down
2.)A.had seated B.seaded C.were sitting D.sat down
我想选C和B,第二题感觉好像对着呢,应该是祈使句,但第一题的CD不知道有什么区别,希望会的同学帮忙区分一下两句话的考点和每个选则的原因

第一句中,在A和C 中选择.因为,seat不能直接用,sit down 也是不能直接用,常用语祈使句或者自己独立作为一个短语句子.又因为在这个句子中,主句是the report began.逗号前半部的句子是从句,也很可能是条件或者假设的从句,所以分词形式完全可以用,没有实际意义,只表示条件或者假设.现在分词表示动作正在进行,过去分词表示动作已经完成并且对现在有影响,所以选择A.
第二句,也选择A

1）All the students ( ),the report bagan.2) All the students All of the students listened carefully ______the report. all the students 和 all of the students 分别? all the students 还是all of the students of all the students he All the students( )(be)here all the students 和the all students,all the.和 the all .有什吗区别? 1.（）,all the students would hear. all of the students ,all students 和all the students区别 all students和all the students有什么区别? All the students ( )so deeply by the report that they couldn The students are all () the exam.