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56 （）

I__________ swim in summer when I was young.

• A、used to
• B、used
• C、was used to
• D、did used to

What is pretty much settled according to Paul Sereno?

• A、Half of the dinosaurs lived alone. 

• B、Most dinosaurs moved long distances

• C、Many dinosaurs settled in the north. 

• D、Some dinosaurs lived in big groups.