他一生致力于环境的改善。
A.He is devoted all his life to improving the environment. B.He is devoted all his life to improve the environment. C.He devoted all his life to improving the environment.正确答案C
他一生致力于环境的改善。
A.He is devoted all his life to improving the environment. B.He is devoted all his life to improve the environment. C.He devoted all his life to improving the environment.正确答案C
