问题
                    
When he was a little boy,he ______ on the farm.
                            A:used to working
B:used to work
C:got used to work
D:was used to work
                        
                        B:used to work
C:got used to work
D:was used to work
正确答案是:
                        
                        
                        
                    同类题型
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