At no time      the rules of the game.It was unfair to punish them.

A．they actually broke

B．do they actually break

C．did they actually break

D．they had actually broken

期货投资者保障基金应当实行（），并与保障基金管理机构管理的其它资产有效隔离。

A.独立核算

B.分别管理

C.独立管理

D.分别核算