问题
The price system is a complex network composed ofthe prices of all the products bought and sold in the economy as well as ofa great number of services
A:all theirhomes
B:all whosehomes
C:all of whosehomes
D:all of theirhomes
B:all whosehomes
C:all of whosehomes
D:all of theirhomes
正确答案是：
