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He never fails to write to his parents once a month . | 他每个月都会给父母写一封信。 | He never fails to write to his mother every month . | 他每个月都会给母亲写信。
He never fails to come to see me every day . 他每天都会来看我。
He never fails to write to her every week . 他每周都会给她写信。
My sister never fails to write home once a month . 我姐姐每月都会写信回家一次。
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