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

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Theteacherwith3students()anexperimentlastnight.Theyhaven''tfinishityet.A.wasdoingB.havedoneC.hasdoneD

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
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!

答案是D，你看四个选项，就是时态的差别，A是过去进行时，BC是现在完成时，D是一般过去时。题干中出现了last night!是一般过去时的标志，故选D!

这道题考到的语法知识是主谓一致里的假性主语这部分的知识，the teacher是第三人称,即使后面带了with the students，with the students 是假性主语，谓语动词依照原主语而定，故B排除选项,又因为last night是具体时间，所以用一般过去时，这里考了时态的知识点，A选项的是用于过去进行时，B选项是用于现在完成时，C选项是用于过去完成时，所以选D为什么会有误差？...

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[昨天晚上我们直到老师离开学校才回去。]原因很简单，时间是last night(昨晚)Last night we _ back until the teacher left school. a went b didn

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