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He has done     to improve his English. A.something useful B.anything useful  C.useful nothing D....

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shouldn't  wouldn't  needn't  couldn't  
That; had done   It; has done   As; has done   As; did  
something useful    anything useful    useful nothing    useful anything  
maintain  improve  preserve  protect  
Having done                 Done      He has done                 He had done  
has been done    have been done    had been done    has done  
he has done as I asked    he has done like I ask    has he done as I asked    has he done like I asked  
change  improve  assess  harm  
maintain  improve  assess  protect  
maintain  improve  assess  protect  
maintain  improve  preserve  protect  
Having done     Done    He has done     He had done  
maintain  improve  assess  protect  
maintain  improve  assess  protect  
change  improve  assess  harm  
something useful    anything useful    useful nothing    useful anything  
What    That    Whether    If  
What are you doing  What are you up to  What do you think  What have you done  

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