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I fell asleep while working on this paper _______ the computer on.

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when   then   that   in which  
A. after   before   while   until  
before  after  while  when  
after    before    while    as soon as  
after    before    while    as soon as  
as    for    over    with  
sleepy, asleep    asleep, asleep    sleepy, sleepy    asleep, sleepy  
had fallen asleep    have fallen asleep    fell asleep    fall asleep  
had fallen asleep    have fallen asleep    fell asleep    fall asleep  
as    for    over    with  
when  then  that  at which  
after    before    while    as soon as  
Since    While    Because    Once  
as    for    over    with  
after    before    while    as soon as  
after    before    as soon as    while  
after    before    while    as soon as  
had fallen asleep    have fallen asleep    fell asleep    fall asleep  
after  while  before  if  

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