问题
                    
His father told me that he ____for the United States three days _______
                            A:has left; ago
B:had left; ago
C:left; ago
D:had left; before
                        
                        B:had left; ago
C:left; ago
D:had left; before
正确答案是:
                         
                        
                        
                    同类题型
                    ________ great progress Little Jack has made! He made______ few careless mistakes in the final.
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uld take good care of the elderly, as they are______ to the sudden change of weather.