问题描述：
as its sales of computer product have surpassed those of measuring instruments,the company has become increasingly willing to compete for the mass market sales it would in the past have conceded to rivals.我想问下it would in the past have conceded to rivals .这句起什么作用,我认为是定语从句,但关系代词(that,which)呢?而且做什么成分?什么时候关系代词可以省略?
问题解答：
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