一道英语情态动词的选择题----I heard they went skiing in the mountains last winter.----It( ) true because there was little snow there.我觉得应该是mustn’t be为什么答案是couldn’t be?

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一道英语情态动词的选择题----I heard they went skiing in the mountains last winter.----It( ) true because there was little snow there.我觉得应该是mustn’t be为什么答案是couldn’t be?
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一道英语情态动词的选择题----I heard they went skiing in the mountains last winter.----It( ) true because there was little snow there.我觉得应该是mustn’t be为什么答案是couldn’t be?
一道英语情态动词的选择题
----I heard they went skiing in the mountains last winter.----It( ) true because there was little snow there.
我觉得应该是mustn’t be
为什么答案是couldn’t be?

一道英语情态动词的选择题----I heard they went skiing in the mountains last winter.----It( ) true because there was little snow there.我觉得应该是mustn’t be为什么答案是couldn’t be?
mustn't be不能用来表达推测的用法.所以你的答案是错的.
而couldn't be是可能不的意思,正好用在这里表示推测.

mustn't 表示 禁止
否定结构是 can't 和could't 表示 不可能

在英语口语中很少用mustn’t be,如果需要通常用needn’t表示
在这句话中表示不可能应该用could表示可能性,而不是能够的意思

couldn’t表示对过去否定的猜测,意为:不可能。musn’t表示禁止

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