【题目】______ the air clean, we can take the metro to school. ( )
A.KeepB.To keepingC.KeepsD.To keep
【答案】D
【解析】
略

编辑:chaxungu时间:2026-04-11 01:05:55分类:小学英语题库
【题目】______ the air clean, we can take the metro to school. ( )
A.KeepB.To keepingC.KeepsD.To keep
【答案】D
【解析】
略
