标有“6 V  1.5 W，通过它的电流随两端电压变化的关系如图所示，若把这样的三只灯泡串联起来，接在12 V的电源两端，灯泡的实际功率约为

A.0.67 W        

B.0.8 W

C.0.96 W        

D.20 W

Had I known about this computer program, a huge amount of time and energy       .

A．would have been saved

B．had been saved

C．will be saved

D．was saved