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[A] stages [B] periods [C] years [D] sessions
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We have three periods of chemistry a week.(英译中)
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A.rankB.listC.ageD.period
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A.yearsB.decadesC.centuriesD.periods
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【C16】A.gapsB.ceasesC.intervalsD.distances
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【C7】A.intervalB.durationC.spanD.period
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【C6】A.distancesB.gapsC.intervalsD.length