用they used to keep pets.否定,疑问各造两句话,翻译

分类: 作业答案 • 2021-12-20 13:15:41

问题描述：

答

否定句
they used not to keep pets
they used to keep no pet
疑问句
一般疑问句did they use to keep pets
特殊疑问句what did they use to keep