问题描述： we must keep the room clean.clean为什么不加ing 1个回答 分类：英语 2014-11-26 问题解答： 我来补答 keep+宾语+宾补（可以是形容词,ving等)we must keep the room clean（形容词）I was sorry to keep you waiting (ving) 展开全文阅读
