Some of the pyramids still look much as they must have done when they were b
这是一个多重复合句。其结构如下:
主句:Some of the pyramids still look much 一些金字塔看起来还是老样子
定语从句:as they must have done when they were built thousands 这一点必定在数千年前建造时就是如此,
·【关系代词兼宾语】as (指代前面的整个句子,等于说“这一点”或“正如前面所过的这一点”)
·【主语】they
·【复合谓语动词】must have done (虚拟语气,表示对过去事实的推测。动词done 代替与前面重复的谓语动词 looked)
·【时间状语】when theywere built thousands
基于上述分析,可以把它改写为如下的句子:
Some of the pyramids still look much; they must have looked what they are (on this point) when theywere built thousands.
注:
第一个look 是不及物动词,表示“显示着外表”,第二个 looked 是及物动词,表示“看起来与…一致”
副词 much 表示“差不多”或“在很大程度上”