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一个英语问题Life in the country is much better than ____ used to b

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一个英语问题
Life in the country is much better than ____ used to be 10 years ago .
A.what B.that C.it D.which
此题选C.A为什么不对?
1.如果用A what的话,则从句是what used to be 10 years ago.
楼主可以想一下,what在该从句到底做什么成分呢?
1)如果what充当该从句的主语,则be后面的表语到哪里去了呢?
2)如果what充当该从句的be后的表语,则从句的主语到哪里去呢?
所以,用what则导致该从句总是缺少一个成分,所以答案A错误.
2.如果用C it的话,则从句是it used to be 10 years ago.
it做该从句的主语,相当于主句的主语life in the country;
而且该比较状语从句it used to be 10 years ago和主句Life in the country is much better刚好对应,只不过从句存在省略而已.
再如:I'm taller than he is.