Itsnecessaryforyou的精选

问题详情：It'snecessaryforyou       theclassroomclean,class.A．keep   B．keeping   C．tokeep【回答】C【解析】句意：同学们，保持教室干净对你们来说是必要的。keep动词，保持。本句为固定句型It’s+形容词+fo...