问题描述: if 可以省略they are吗,就像while(they are)good这样?相信谁 1个回答 分类:英语 2014-10-30 问题解答: 我来补答 可以的,但要在对方明确你所指的东西时.比如You can take them home if they are clean.= You can take them home if clean. 展开全文阅读