弗里德曼的货币需求函数强调的是（）。

A.恒常收入的影响

B.人力资本的影响

C.利率的主导作用

D.汇率的主导作用

It was in the factory _________ his friend worked  _______ he picked up a lot of experience.

A．where, where

B．that, where

C．that, that

D．where, that