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改错题。 ( )1. On October, 2006, they toured Poland and enjoyed themselves . A B C D ( )2. While was still a small boy , I became well-known A B C D ( )3.Mozart was so clever that he was a talent musician. A B C D ( )4.— When did you begin to learn ride a bike? — Four years ago . A B C D ( )5. They joined the Brazil in 2005. A B C D ________ ________ ________ ________ ________