问题
                    
I was surprised to find the snack shops around the school empty; the students everything!
                            A:had been buying
B:had bought
C:have bought D.have been buying;
D:have been buying;
                        
                        B:had bought
C:have bought D.have been buying;
D:have been buying;
正确答案是:
                         
                        
                        
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