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14.This doubt had been in my mind for some time, but the research still went on____some reasons.

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By the time    Until    After    Unless  
did my dog die    my dog died    my dog has been dead    my dog had been dead  
have been sitting    am sitting    had been sitting    was sitting  
Hello, Mary. They must have had me confused with my brother, George. He has been sick all week. I have never felt better in my life.  Hello, Mary. Who' s sick How can I be sick I' m as strong as a horse. They must have gone mad.  Hello, Mary. How are. you  Hello, Mary. I' m quite happy. My wife has fallen iii. And, how about you  
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worked    had worked    have been working    have worked  
Had my brother not  Was my brother not  If my brother had not been  if my brother was not  
m. to prepare a report for my boss. —____ you look very tireD. A. No doubt    No hurry    No wonder    No need  
painted   had painted  have painted   have been painting  
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Until  Unless  After  As  
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Hello, Mary. They must have had me confused with my brother, George. He has been sick all week. I have never felt better in my life.  Hello, Mary. Who’ s sick How can I be sick I’ m as strong as a horse. They must have gone mad.  Hello, Mary. How are. you  Hello, Mary. I’ m quite happy. My wife has fallen iii. And, how about you  
By the time   Until   After   Unless  
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