问题
                    
Hawking became world-famous in _______
                            A:his thirties in the 1970’s
B:the thirties in his 1970
C:his 30s in 1970’s
D:the thirties during the 1970
                        
                        B:the thirties in his 1970
C:his 30s in 1970’s
D:the thirties during the 1970
正确答案是:
                         
                        
                        
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