题目

 Victor apologized for __________ to inform me of the change in the plan.    A. his being not able  B. him not to be able  C. his not being able  D. him to be not able 答案：C一只"220 V 40 W"的灯泡L1和一只标有"110 V 40 W"的灯L2，正常发光时： [     ]A．L1 较亮      B．L2较亮C．一样亮        D．无法比较