Everyoneofusshouldkeeptheclassroom___everyday.A.cleanb.cleanedc.cleaningd.toclean为什么不是C?Keepdoing=一直保持在某个状态

问题：Everyoneofusshouldkeeptheclassroom___everyday.A.cleanb.cleanedc.cleaningd.toclean为什么不是C?Keepdoing=一直保持在某个状态

答案：↓↓↓

胡艳丽的回答：

网友采纳　　A.clean　　这里clean是干净的意思.keepsth+形容词keepsb.+doing　　keepthedooropen/closedkeepmewaitingkeepthestudentscleaningtheclassroom.