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〔…の原因となる〕事柄, 根拠〔for, of〕‖It is a 〜 for [of] regret that he did not keep his promise. ((正式))彼が約束を守らなかったのは🔗⭐🔉
5〔…の原因となる〕事柄, 根拠〔for, of〕‖It is a 〜 for [of] regret that he did not keep his promise. ((正式))彼が約束を守らなかったのは残念なことだ(＝((略式)) It is a pity that ...).
〔…の原因となる〕事柄, 根拠〔for, of〕‖It is a 〜 for [of] regret that he did not keep his promise. ((正式))彼が約束を守らなかったのは残念なことだ(＝((略式)) It is a pity that ...).
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