The old man is in good health except that his sight___day by

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The old man is in good health except that his sight___day by day.
A.has lostB.was lost C.is being lostD.will lose我需要科学的解释,不要仅为答案喔,

第一,时态.day by day 一天天地,强调逐渐的过程,进行时可用来表示近段时间内的变化如：it is becoming colder and colder. 天越来越冷了.而完成时强调的是结果或影响,所以A 不选；根据主句中 is 判断是讲述现在的事情,由此排除 B, C.
第二,语态.lose one's sight, 视力下降,his sight 在前就和lose 之间构成了被动关系.
综上所述,此句填 is being lost 现在进行时的被动语态.

The old man is in good health except that his sight___day by What good health the old woman is in!怎么翻译? what good health the old woman is in The old man is good with his grandson The old man ____ _____ The old man living by his daughter everybody, that is ,except his six-year-old daughter Taken good care of by his family ,the old man lived ------- The old man works hard because he is in poor health.(改错） the old man works hard becaus he is in poor health 单句改错：The old man works hard because he is in poor health. 22.The old man walked in the street,______.A.followed by his the old man walked in the street ,为什么后接followed by his son ,