— What did you do last vacation?
— I ______ at home.
A:stay
B:will stay
C:staied
D:stayed
如图,CA⊥AB,垂足为点A,AB=8,AC=4,射线BM⊥AB,垂足为点B,一动点E从A点出发以2/秒的速度沿射线AN运动,点D为射线BM上一动点,随着E点运动而运动,且始终保持ED=CB,当点E运动 ____秒时,△DEB与△BCA全等.