请教OG11-5

As its sales of computer products have surpassed those of measuring instruments, the company has become increasingly willing to compete for the mass market sales they would in the past have conceded to rivals.

A. they would in the past have conceded to rivals

B. they would have conceded previously to their rivals

C. that in the past would have been conceded previously to rivals

D. it previously would have conceded to rivals in the past

E. it would in the past have conceded to rivals

答案E。我想知道划线部分在句中是什么成分？难道是定语从句修饰the mass market sales ？如果是，那concede的用法是什么呢？难道是concede X to Y 这种形式？X就是这里的the mass market sales 是这样吗？

请大家指点啊！谢谢啦！

划线部分是定语从句，省略which在句中做宾语

for the mass market sales （which）they would in the past have conceded to rivals

concede to (sb.)  对(某人)让步

eg. The defeated nation conceded some of their hand to the enemy.

也就是说concede the mass market sales to rivals 请问是这样吗？