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                              Q:
                           
                           
                                                      | A) I do not understand why | B) why in spite of my best efforts to please him | 
| C) my boss is so angry at me. | D) No error | 
                              Answer:   D) No error
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
There is no error in any part. The sentence is grammatically correct.
 
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