问题
                    
DrMaoperated_______over150patients_______hisvisittothatpoortown. [ ]
                            A: in,while 
B: on,during
C: for,in
D:on,for
                        
                        B: on,during
C: for,in
D:on,for
正确答案是:
                        
                        
                        
                    同类题型
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