
[A2]
体 vs 时
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Multiple Choice
句末 了
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Multiple Choice
动词后 了
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Multiple Choice
了 的否定
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Multiple Choice
经历 过
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Multiple Choice
过 的否定
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Multiple Choice
持续 着
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Multiple Choice
着 vs 在
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Practice Exercises

Multiple Choice
三者对比
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Practice Exercises

Multiple Choice
常见误区
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Practice Exercises

Multiple Choice