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(4分) Until the early twentieth century, it was always unsuccessful to transfuse blood(输血) from on...

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it was  was not  was  it was not  
with        for         as          through  
if    when    before    until  
with        for         as          through  
man did know    man knew    didn’t man know    did man know  
until  so that   because  before  
until 12 o'clock in the evening  until early next morning  all day and all night  until after 12 o'clock in the evening  
Until  If  Unless  If only  
Until  If  Unless  If only  
because    until    so that    that  
should    would    did    could  
in   for   until   since  

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