问题描述:
Are these your a set of keys?这个句子对吗,可以这样问吗,
还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.
还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.
问题解答:
我来补答展开全文阅读