问题描述: 填空:Unless[ ](invite)to speak,you should remain silent at the conference. 1个回答 分类:综合 2014-11-12 问题解答: 我来补答 这是一个省略句,从句应该是被动的,意思是:除非你被邀请说话,否则在开会时就应该保持沉默.填invited相当于:Unless you are invited to speak,you should remain silent at the conference. 展开全文阅读