用was,were填空
用 was, wasn't 或 were填空.
用there was 或there were 填空
用“am/is/are/was/were"填空
用am,is,are,was,were填空.
用was ,were,wasn't 填空;
用is,are,was 或were填空
用is,are,was或were填空 急用
1、用 am ,is ,are ,was ,were ,填空
什么时候用was / were
用was,were,is,are填空. ______they students?Yes,____ ____.
用“have,has,had,there is,there are,there was,there were”填空.
用be动词(am,is are ,was,were)的正确形式填空