To sell such a suit as that （is） to a millionaire!
这个句子中as是介词,意思是像那样.和它引导的定语从句一样的意思.就是结构不同.如后面加上is那就是它引导了定语从句.因先行词被such修饰所以用as来引导.如下面的例子
I have never heard such things as you told us. （as引导的正是定语从句和它也是因为先行词被such修饰）
I have never heard such things as that.(这句中的as是介词和你给的句子一样,这样后面就不是从句但从意思上看也相当于上面那样的定语从句.)
在宾语从句中的时态要看主句.分两种情况. 当主句为一般现在时,从句根据时间状语可用各种时态.如 I want to know where you went yesterday.
当主句为一般过去时,从句也用过去时的一种,除客观真理用一般现在时.如
He told me that he would go to Beijing next month.
He told me that he had met Tom the day before.
The teacher told us that the earth goes around the sun.(客观真理用一般现在时)