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用所给单词的适当形式填空。    1. Tom______(swim) for two h

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用所给单词的适当形式填空。   
1. Tom______(swim) for two hours in the river.
2. When______you______(buy) the new computer?
3. When I entered the classroom, I found some students______(watch) TV.
4. There are some children who______(play) football on the playground.
5. —How long______ you______ (do) that?
    —For about five years.
用所给单词的适当形式填空。    1. Tom______(swim) for two h
1. has been swimming    2. did , buy   3. watching    4. are playing    5.  have, been doing