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Tom has    (difficult) in learning math. We should help him.

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What do you think has happened to Tom    What do you think Tom has happened    Do you think what has happened to Tom    Do you think what Tom has happened  
us difficult    us to be difficult    difficult for    it difficult for us  
if Tom doesn’t have    if Tom has    unless Tom doesn’t have    unless Tom hasn’t  
But he was here just now.A. where Tom was    where Tom has gone    where can I find Tom    where has Tom been  
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