As he never raises a finger to help me with the dinner, I       the thanksgiving meal from this afternoon till now.

A．have been preparing

B．prepared

C．had been preparing

D．prepare

________坐落在北京南北中轴线北端的一组古代建筑，作为元明清三代都城的报时中心，前后延续达600多年。鼓楼高46.7米，共设更鼓________面，________面主鼓，________面群鼓。铜钟为明永乐年间铸造，重约______吨，与大钟寺古钟博物馆的“________”同期铸造，是我国现存重量最大、铸造最早的古钟。