Attempts in high school English classes to focus writing instruction on creative, free-flow composition, which many educators consider more engaging than lessons in formal grammar, has not materially improved the writing ability of first year college students.
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Ahas not materially improved the writing ability
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Bhas not been material in improving the ability to write
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Chad not brought material improvement to the writing ability
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Dhave not materially improved the writing ability
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Ehave not been material in the improvement of the ability to write
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正确答案: D