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can't &mustn't

分类: 作业答案 • 2022-03-18 21:06:30

问题描述：

can't &mustn't
There"s no light on =they _____be at home .
选can't 还是mustn't
我觉的它们很难区分啊（在这样的题形中）
我当时就选了mustn't
可是答案是can't
你是如何做的,

答

表示推测时,肯定句must,否定句用can't

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