They have come.怎么不是came他表达的是哪中意思?他们来了(是正在往这里赶还是已经到了正在等)

为什么They have come.come是原形而They have gone.gone就不是原形 Tom with his parents_____to America.They _____back in two weeksA.have gone;will come Bhas gone;will come C have been;have come D have been;come They have come.怎么不是came他表达的是哪中意思?他们来了(是正在往这里赶还是已经到了正在等) They ____ here for more than a month.A.have arrived B.have reached C.have come D.have been Have come 怎么用 have they come back yet意思 They dreams have already come true 为什么是come 而不是came 后面不是说already（早已）了还有 为什么是have 而不是are With the development of technology,computer have come into the market__capable of doing verycomplicated calculation at great speedAthat they are B which are C that is Dwhich they are c,d怎么不对 They are still discussing whether I_____to the meeting yesterday,which I think was not necessary at all.A.could come B.should have come C.should come D.must have come 选B.为什么?C为什么不行? Friend：they came home late.You：It was inconsiderate of them 《to have came》 home late.为什么不是to come when the festival they have been looking forward to--------people will dress up to celebrate ita.coming b.comes c.come d.came是选b。不是简单的短语形式！！！ Lucy and Lily can speak Chinese well,because they ___ China for six yearsA.have been toB.have been in C.have come to D.have gone to let is-----lunch until they all come back A have B not have C not to have D dont have 选哪个 Have they found a way to stop the flu in the school?Yes,they have already ( )up with an ideaA.looked B.put C.come D.get A.have come B.had come C.have been First of all,they may have come to this planet of ours thousands or millions of years ago为什么用现在完成式have come to,后面不是有years ago.不用过去完成式had come to He asked me A if she will come B how many books I want to have C what was wrong whith meD they would help us do it C D怎么选 I will come at ten,_______ they have already left.A.which B.that C.that D.what