Explanation:
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The correct answer is B. Father
Before he left the house modifies father because it further explains the father's qualities, that is he is a person that's left the house.
        
                    
             
        
        
        
The last answer sets the most formal tone; "Hello! I was very pleased to meet you at the party last week." the rest are very casual. 
 
        
             
        
        
        
Answer:
I think it is B Hope it help You
Explanation: