You couldn't have seen such an animal, for they have already ___ in the world.A died awayB died down C died offD died out

You couldn't have chosen any gift better for me. can’t / couldn’t have 说明理由.1.Can you ______ this dress _____ a skirt?A.make,into B.make,of C.make,in D.make,for2.You are too young.You ______ ride a bike in the street.A.couldn't B.can't C.mustn't D.needn't3.Jack weighted 8 pounds at ______ (born)4.I have never se couldn't have done和couldn't do的区别 You couldn't be more I couldn't miss you Where have you gone?Mike couldn't find you just now 错了改回来 you could have done much better yesterday.why_____?为什么反问是填didn't you而不是couldn't you? you couldn't have chose any better gift for me如何解释希望说的通俗易懂 I couldn`t have been more mistken .When you drive home,you can’t be too careful. I was really anxious about you.You _______ home without a word next timeA.mustn’t leaveB.shouldn’t have leftC.couldn’t have leftD.needn’t leave I couldn’t have said it better. they couldn't have done better是什么意思 i couldn't have enjoyed any more help!I __ with you because I was in London at the time.A couldn't go B couldn't have gone C shouldn't have gone D needn't have gone I ______ with you because I was in London at the time.A、 couldn't go B、 couldn't have gone C、shouldn't have gone D、needn't have gone you know that you were driving 100 km an hour,don,t you?No officer ,I couldn t have been为什么是couldn t have been 怎么翻译啊 8.---Jane walked past me without greeting.----She _____ you.A.can't have see B.couldn’t see