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Night has fallen,we have to stay here for the night,__

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/07/09 05:29:05
Night has fallen,we have to stay here for the night,__
为什么选don't we而不是mustn't we?
一般的动词都是用don't/do we 回答,在这里,have to 虽然和must都是不得不,但have 对应的助动词是do,所以在这里只能用don't we.
而若该句子改为Night has fallen,we must stay here for the night,__就填needn't we.mustn't表示的是禁止.