I think _______ our duty to keep our environment clean and t

I think _______ our duty to keep our environment clean and t I think it's our duty to keep our environment clean and tidy 1、To keep our environment clean and tidy is our duty.(改为同意句） 英语句型转换1、To keep our environment clean and tidy is our duty.( I think __our duty to keep our evirionment clean an tidy.A.t We must do a lot of work to keep our environment clean and t It is our duty to keep our classroom clean and tidy.中的It《our It is our duty to keep our classroom clean and tidy.中 our du It is our duty to keep our classroom clean and tidy.句中的 clea It is our duty to keep our schoolyard clean and tidy.这句话是主语从 We feel _____ our duty to keep our city clean and tidy. It is our duty to keep our e___ clean and tidy