The teacher with 3 students( )an experiment last night.They haven't finish it yet.A.was doing B.have done C.has done D.did请告诉我这道题有什么语法,什么是重点 .我是一个英语特别特别差的人,请尽可能的讲详细.thank you

My English is i__a lot with the teacher's help. Tom answered the teacher's questions_____(with)_____(think) the children cooperated with their teachers 为什么teacher加s with the help of teacher用with one's help的方式来说with the help of teacher= He is in the teacher’s office.He ( ) with my teacher. with the teacher’s help.with the help of the teawith the teacher’s help.with the help of the teacher’s.这两个句子对吗,错了怎么改 With the teacher's help,Xiao Ming get the first prize in the contest对划线部分提问 划线部分是With the teacher's help match the teacher's I b_____ all the students can pass the exam with the teacher's help. ____,my math is getting better and better.A.Under the teacher's help B.With the teacher's help C.Under the help of the teacher D.By the help of the teacher he past the tast with the teacher’s help.同义句 he past the test ＿ ＿the teacher’s help with the teacher‘s help,i worked out the math problem(同义句)the teacher's help ,I worked out the math problem The man who is talking with my teacher is Tom's father.翻译 Tony's teacher asks him to make sentence with the three words 中文 We can't sing_____dance without the teacher's help.A and B or C with tony worked out theproblem with the teacher ‘s help改为同义句 She is standing with her back against the teacher's desk.这句话怎么翻译? with the teacher's help,Tom made much p_____ this term填空