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Trees help the air clean. ( )A. keep B. keeps C. keeping

编辑:chaxungu时间:2026-04-28 11:37:37分类:小学英语题库

【题目】Trees help ____ the air clean. ( )

A. keep B. keeps C. keeping

【答案】A

【解析】

help(to) do sth帮助做某事