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
网友回答
A. mustn’t have got up
(答案→)B. needn’t have got up
C. needn’t get up
D. mustn’t get up
解析：可联系答.案.网客服索取。