问题

20.—I got up at five this morning, I thought it was Friday. —You _____ so early.It is Sunday today; you don’t have to go to work.
A:mustn’t have got up
B:needn’t have got up
C:needn’t get up
D:mustn’t get up
B:needn’t have got up
C:needn’t get up
D:mustn’t get up
正确答案是: