Restaurants can buy fish in bulk at a fish market. The underlined part means（）

A. give an explanation
B. come off duty
C. become conscious
D. fly into a great rage

A. To do this would be to cut the foot to fit the shoe.
B. He made it a rule to speak English in class.
C. It made us very angry to hear him talk like that.
D. This will be a good opportunity to exchange experience.