The students don't need to hand in their homework at once
这里need既可以做情态（如can ,dare）动词,又可以做实义动词
此处考的是他们的转换
The students needn't hand in their homework at once.改写句子,句意不变
The students needn't hand in their homework at once.改写句子,句意不变
英语人气：931 ℃时间：2019-10-26 19:29:50
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