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- 3i can think of many cases___students obviously knew a lot of english word and expressions but couldn't write a good essa
- 4已知点F1,F2是双曲线x^2/a^2-y^2/b^2=1的两个焦点,以线段F1F2为边作
- 5菠萝英文是什么
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- 7The basketball was invented in America in 1891对划线部分提问(划线部分in America in 1891)
- 8我的老师作文450字的
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