问题
                    
________ we finish the work before class, Jack—No, we_________ . We can do it after class.
                            A:Must, don’t have to
B:Must, must
C:Can, mustn’t
D:Can, needn’t;
                        
                        B:Must, must
C:Can, mustn’t
D:Can, needn’t;
正确答案是:
                         
                        
                        
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