they could have come to your help,but they_____in a traffic jam A had been caught b should catchc were caught d caught

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? Could they have forgotten their class. have they come back yet意思 they could have come to your help,but they_____in a traffic jam A had been caught b should catchc were caught d caught 为什么They have come.come是原形而They have gone.gone就不是原形 they asked me if she could come.中为什么用could They do not have to come.（改为同义句） They ___not come. if you have come this far,maybe you could come a bit further是什么意思 怎么使用so thati opened the door.they could come in.i opened the door so they could come in.i opened the door so that they could come in.可不可以用so that In fact,you did not know they could have been 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 反义疑问句填空They must have come back,______? 请问Joey could get lost and they could have to page us to go pick him Could you tell me---?A.when will they leave Beijing.B.when could they leave BeijingC.when they will leave BeijingD.why she did't come to school 1.-Alan,could you come to help me?-Sorry,dad,I have ______homework to do.A.many B.much C.little D.a little2.They play _____an hour.A.in B.for C.at D.to Could you tell us how they ____ back?A. will come B. had come C. come D. would come选哪个?为什么? 请问选什么时态,为什么?Could you tell me if they ________(come) here tomorrow. If they had taken my advice,they .A.had wonB.could wonC.should winD.could have won