来自罗达立的问题
如果人人都为保护环境做出贡献_______________toprotectingtheenvironment.
如果人人都为保护环境做出贡献_______________toprotectingtheenvironment.


如果人人都为保护环境做出贡献_______________toprotectingtheenvironment.
如果人人都为保护环境做出贡献_______________toprotectingtheenvironment.
Ifeveryonemakesacontribution