Unlike football, which is played on standardized fields, baseball fields vary considerably in both size and shape.
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Abaseball fields vary considerably in both size and shape
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Bbaseball fields vary considerably, in size as well as in shape
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Cbaseball is played on a field that varies considerably in both size and shape
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Dbaseball is played on fields that vary considerably in both size and shape
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Ebaseball is played on a field that varies considerably in size as well as in shape
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正确答案: D