问题
                    
That day they ________ there on foot, but they took a taxi. The place was only 50 meters away from the railway station.
                            A:must have gone
B:shouldn’t have gone
C:could have gone
D:couldn’t have gone
                        
                        B:shouldn’t have gone
C:could have gone
D:couldn’t have gone
正确答案是:
                        