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一道英语单选The tower is so well preserved that it looks as it____

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一道英语单选
The tower is so well preserved that it looks as it__________ a century ago.
a. did b,was c.used to be d.would
答案是A BC少表语?那么A为什么不缺成分呢?分析一下句子结构 谢谢!说下解释!
一道英语单选The tower is so well preserved that it looks as it____
主句:The tower主语,is系动词,so well preserved表语that与前面的so一起构成so……that结果状语从句几本结构意为如此以至于…….从句:it主语,looks as系动词词组,后面it did a century ago.是表语!其实前面省略了that,所以后面是表语从句.如你所问:表语从句中句中用did其实是指代的preserved,as引导的表语从句中as可以做成分,as用于此句中did指代的preserved的宾语意为preserved as it was a century ago!大致能了解吗?