Nobody has told me about it?为什么用的是has told 现在完成时态?为什么不是Nobody tell me about it?

Nobody has told me where to go改成被动语态 Nobody has told me about it?为什么用的是has told 现在完成时态?为什么不是Nobody tell me about it? There's a baseball match this aftertoon.Didn't you know?_____.Nobody told me about it. Mother ( ) me that she had bouhgt a dictionary for meA told B had told C has toldD tells为什么 I hardly understand _____he has told me.A.that B.what C.which.选A行不行. from what my mum has told me,he sounds填空a nice person. I hardly understand. ___ he has told me. A. that B. what C. which D. who I hardly understand.___ he has told me.A.that B.what C.which D.who He told me that he ( )a cold for three daysA has B had caughtC had hadD has had A little birdy told me My friend told me that there was a truck__rubbish outside.A.has collected B.is collecting C.wasMy friend told me that there was a truck__rubbish outside.A.has collected B.is collecting C.was collecting D.collecting He had told me和he has told me的区别 When I was a child,my teacher told me that the earth_________ round.A.wasB.had beenC.has beenD. Mike told me that he ______ out the week before.A)has been B)is C)had been D)was My father told me that he ____ the book in 1986A.readsB.readC.has readD.had read The type of stories my mother told me in my childhood __again(a)have never been heard (b)has never Your papa has told me about it.啥意思? he told me what he has done是个什从句?