After entering high school, he felt regretful for the time he had wasted playing computer games and studied hard to ________ it.

A．sum up

B．take up

C．make up

D．hold up

基金是一种大众化的投资工具，各国对其称谓不尽相同，如（）。

A.共同基金

B.单位信托基金

C.证券投资信托基金

D.证券投资基金