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One reason it is difficult to know why the whales are dying is that ______.

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difficult  much difficult  very more difficult  much more difficult  
a;a   a;the   the;the   the;a  
the difficult one    a hard one    an easy one    the very one  
as difficult as; expensive    as more difficult as; more expensive
  
as difficult as; more expensive    more difficult as; as expensive
  
difficult  much difficult  very more difficult  much more difficult  
the more difficult    the most difficult   most difficult    more difficult  
so easy as            as difficult as   much difficult than        less easier than  
so easy as    as difficult as    much difficult than    less easier than  
not so easy as    easier than    as difficult as    less difficult than  
it is difficult to get such a chance again   one can never get such a chance again   such a chance will never come again   to get such a chance will be difficult  
difficult    much difficult    more difficult    the most difficult  
so easy as   as difficult as   much difficult that   less easier than  
difficult    much difficult    more difficult    the most difficult  
twice so difficult as    twice as difficult as    as twice difficult as    so twice difficult as  
No, it is    Yes, it is    Yes, it isn’t    No, it isn’t  
why; because  that; why   why; that  /; because  
as difficult than    so difficult as    as more difficult as    as difficult as  
difficult    much difficult    more difficult    difficulter  
a;a   a;the   the;the   the;a  

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