有关情态动词的一道题there wasn't anyone on the nightclub door so we_ proof of our age.A didn't need to show B needn't have shownC couldn't show D mustn't show为什么选A而不是B?有什么区别?

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/02 08:17:06
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