问题
                    
Do you know _________ the meeting?—Tomorrow morning.
                            A:when they had
B:when they are going to have
C:when did they have
D:when are they going to have
                        
                        B:when they are going to have
C:when did they have
D:when are they going to have
正确答案是:
                        
                        
                        
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