英语单句改错,在线等!20分,会追加!
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1.it is not easy for us(to) study a foreign language well .

2.though he is a young teacher ,he achieve a great deal in teaching .

去掉though或but

3.china is a (developing) country in the world .

4.i often hear the song (sung) .

5.they were (satisfied )with out work .

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