The students don't need to hand in their homework at once
這里need既可以做情態(tài)（如can ,dare）動詞,又可以做實義動詞
此處考的是他們的轉(zhuǎn)換
The students needn't hand in their homework at once.改寫句子,句意不變
The students needn't hand in their homework at once.改寫句子,句意不變
英語人氣：599 ℃時間：2019-10-26 19:29:50
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