The extent to which 引导的是什么从句

VFM: the extent to which a government, business person or consumer gets a good deal from the money which they spend on goods or services.

The extent to which 引导的是什么从句？which后面是否省略了that呢？which后面的从句不缺成分，是否可以由此判断出which引导的是同位语从句？

VFM: the extent to which a government, business person or consumer gets a good deal from the money which they spend on goods or services.

The extent to which 引导的是什么从句？which后面是否省略了that呢？which后面的从句不缺成分，是否可以由此判断出which引导的是同位语从句？

【答】第一，这不是一个完整的句子，而是一个名词性短语：the extent（程度），后面的to which...是一个定语从句，修饰这个extent。意思是：

政府、商人或买家在产品或服务上所消费的资金，而从中得到便宜（a good deal理解为“非常大的便宜；物超所值”）的程度。

也就是说，买家个体花了资金购买产品或服务，从中得到便宜的程度怎么样。

which 之前加to，是由于to the extent（到达某种程度）的原故。没有同位语的问题。

先行词是the extent，后跟 to which的例句：

No one can forecast the extent to which traffic will grow.

无人能预测以后交通流量会增长到什么程度。

She didnt realize the extent to which she had been distracted.

她没意识到她心烦意乱的程度。

The extent to which the Court will modify these doctrines is, as yet, unclear.

法院对这类原则修正的范围目前尚不了解。

The extent to which women have lost their rights in Iraq is shocking.

伊拉克妇女丧失权力的程度让人震撼。