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So far there have not been definite data to confirm ________.

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has joined  has been joined   have joined  have been joined  
might be    may have been    should have been    could be  
is paid back    have been paid off    has been paid off    are paid off  
have    has    have been    has been  
have, come to  have, been to  have, been in  have, gone to  
have taken    have been taken    had been taken    had taken  
are rescued    were rescued    have been rescued    had been rescued  
are used to living    are used to live    have been used to living    have been used to live  
is loaded  are loaded  have loaded  have been loaded  
By far  So far  As far as  Far from  
virus subtypes(子类型) have been found in pigs. A. By far    As far as    So far    Till far  
so far;making  so far not;to make   up to now;made  till now not;makes  
joined    have joined    join    have been in  
have been completed  has been completed  has completed  have completed  
virus subtypes(子类型) have been found in pigs. A. By far   As far as   So far    Till far  
that has been    what have been    which has been    that have been  
have been completed  has been completed  has completed  have completed  
is, is eaten    are, have been eaten    are, are eaten    is, have been eaten  
have; come to  have; been to  have ; been in  have; gone to  
isn’t    weren’t    hadn’t been    shouldn’t have been