单句改错
It was the second time that I have been in China.
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I was nervous because I didn't know how to expect.
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Keep up it, and you will succeed.
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I thought that the author of the article knew far more than what I did.
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If you go by train, you can have quite a comfortably journey, but make sure you get a fast one.
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Many companies are using plastic as substitute for steel.
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