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It'snecessaryforyou theclassroomclean,class.A.kee...
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...