问题描述:
I come all the way to say 3Q for your help and we ( )it without you.
是情态动词+have done 为什么不可以添mustn‘t have done和shouldn't have done
而必须添couldn’t have done
是情态动词+have done 为什么不可以添mustn‘t have done和shouldn't have done
而必须添couldn’t have done
问题解答:
我来补答展开全文阅读