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,

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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,
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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,
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,

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.

C.is being lost
因为这里day by day强调了是一天天视力下降的过程
译文:这个老人除了视力一天天下降外,身体还是很健康的。
由于前面半个句子里The old man is in good health时态用的现在时态,直接排除B.was lost
A.has lost 已经失去视力的意思 不符合
D.will lose将会失去视力...

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C.is being lost
因为这里day by day强调了是一天天视力下降的过程
译文:这个老人除了视力一天天下降外,身体还是很健康的。
由于前面半个句子里The old man is in good health时态用的现在时态,直接排除B.was lost
A.has lost 已经失去视力的意思 不符合
D.will lose将会失去视力

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C强调渐渐地过程