Is this your eraser?NO,it is not.Ithink{ }

问题描述:

Is this your eraser?NO,it is not.Ithink{ }
1;it his eraser 2;its his eraser 3;it is his eraser改选哪一个

选三
答案一缺少谓语
答案二的 its是意思它的 ;如改成 it's 就 可以