问题描述: what has been down has been down成分分析 1个回答 分类:英语 2014-12-14 问题解答: 我来补答 这个句子是主语从句,其中"what has been down"是主语(或主语从句),"has been down"是谓语. 再问: 为什么HAS BEEN DOWM后面不+宾语 再答: 因为这里是被动语态。 展开全文阅读