Three women who secretly buried an 80-year-old woman were put into prison at Birmingham ye
ster day. Two of then), including the dead woman's daughter, kept on collecting her pension (退休金) after her death until their secret was made known to others two years later. The court (法庭) heard that one of the women put on "an Oscar (奥斯卡金奖)--winning performance" by pretending to be the old woman asleep in bed when a social worker called five months after Mrs. Townsend's death.
Mrs. Townsend's death had been covered up and it was discovered ______.
A.only yesterday
B.five months afterwards
C.two years afterwards
D.quickly