It is our duty to keep the classroom c--------.
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 classroom clean and tidy.这句话谁做主语谁
It's on duty to keep our classroom clean 改为同义句
It is my duty to keep my classroom clean and tidy it 是形式宾语还是
it is our duty to distribute to the society翻译
Waste paper shouldn‘t everywhere.It‘s our duty to keep our c
It is our duty to keep our schoolyard clean and tidy.这句话是主语从
It is our duty to keep our e___ clean and tidy
It is our duty to protect the environment
it is our duty to protect the environment.