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B.
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16. Before, I didn’t like winter. I couldn’t go out to play. Now, I like it. I can go skating.
( )17. —What did they do last Sunday? —They played badminton.
( )18. —Could you see stars at night? —Yes, I liked the stars.
( )19. There was no museum in my town. Now there is a big museum in my town.
( )20. At that time, there were no planes in the Ming dynasty.
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