With a modal verb:What an impressive paper! Actually, you 1 have written such a long essay. The professor only asked for four or five hundred words.
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【正确答案】 1、正确答案：needn’t    
【答案解析】解析：通读句意可知，这里要表示“不必要做某事”，可用情态动词中need的否定形式来替代。答案为needn’t。