问题
                    
It is known to us __________ it was not until 1938 ________ the first colour TV programme began to be broadcast in the world
                            A:that, which
B:/, /
C:that, that
D:which, that
                        
                        B:/, /
C:that, that
D:which, that
正确答案是:
                         
                        
                        
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