it is use ful to be able to predict the extent__...

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it is use ful to be able to predict the extent__...
it is useful to be able to predict the extent__which a price change will affect supply and demand.
A.from B.with C.to D.for
我知道是介词＋which形式,可是我还是想不通,

在这个从句中which指代了extent,所以这个介词相当于是放在extent前面,那么在以下的选项中可以和extent连用的,只有C to了.
另一方面,从句子的意思上来说：
It is useful to be able to predict the extent
能够预测(这个范围)是很有用的
to which a price change will affect supply and demand
在(这个范围)之内价格变化会影响供求关系
在这个意义上而言,我个人认为用介词"within"也可以的
所以这句话完整的释义就是：
能够预测对供求关系造成影响的价格变化的范围是非常有用的.

it is use ful to be able to predict the extent__... It is useful to be able to predict the extent to which a pri It is useful to be able to predict the extent ________ which It's useful to be able to predict the extent to which a pric 分析下面句子,如下the most difficult thing is being able to predict w 英语翻译it is a great relief to be able to talk to you about the "It is the mark of an educated man to be able to entertain a it is my to be able to have existence be able to open it The very best way to predict the future is to create it!” 中文 the best way to predict the future is to invent it这句话的是谁说的? it is the intent that ospf be able to converge around these