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                              Q:
                           
                           
                                                      | A) The children said that they had been busy playing so they have not noticed the stranger. | B) The children said that they had been busy playing so they had not noticed the stranger. | 
| C) The children said that they have been busy playing so they had not noticed the stranger. | D) The children said that they have been busy playing so they have not noticed the stranger. | 
                              Answer:   B) The children said that they had been busy playing so they had not noticed the stranger.
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
 
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