—What else did you do this morning besides doing the shopping?

—Two hours__________washing the windows and the floor.

A．were taken

B．was spent

C．has taken

D．will be spent

采用定期盘存法时，平时只记录存货购进的数量和金额，不记存货发出数量和金额，期末通过实地盘点确定存货的实际结存数量，并据以计算出期末存货的成本和当期耗用或已销售存货的成本。这一方法通常也称为“以存计销”。 ( )