The earthquake ______ when I _______some cleaning.

A．starts, was doing

B．started, was doing

C．was starting, was doing

D．starts, were doing

根据我国《保险法》规定，在财产保险合同中，保险金额低于保险价值的，除合同另有约定外，保险人按照保险金额与保险价值的比例承担赔偿责任。