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(8分)It has been seen as a hi﹣tech bike﹣sharing boom that entrepreneurs hope will make them rich whi...

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Have seen; had gone to    Had; seen; had gone to    Did; see; has been to    Had; seen; Had been to  
has agreed; to be seen    has been decided on; to be seen    has been reached; being seen    has been determined on; being seen  
went to  has gone to  has been in  has been to  
has seen; has been    saw; saw    saw; has been    has seen; saw  
went to  has gone to  has been in  has been to  
He _______ there three times.A. has been to; has gone to    has been to; has gone   has gone to; has been to    has gone to; has been  
went to    has gone to    has been in    has been to  
has gone to; has been to    has gone to; has been    has been to; has been    has been to; has gone  
has seen    was seen    is seen    has been seeing  
has gone to; has been to    has gone to; has been    has been to; has been    has been to; has gone  
A. have gone to    went to -   have been to    have been in
  
went to    has gone to    has been in    has been to  
Was; I have seen    Has; have I seen    Did; had I seen    Were; I had seen  
has seen  saw  has been seen  was seen  
to be seen    to see    seeing    has been seen  
He _________there twicE. A. has been to; has gone to    has been to; has gone    has gone to; has been to    has gone to; has been  
Has been; will be    has gone; will be    has been; has been    has gone; has been  
has  has been  has to be  was  
saw    was seen    has been seen    has seen  
has gone to    has been to    has gone in    has been in  

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