如果只是根据你给的题目来看,答案都是有问题的哦
A don't need to +do sth ,翻译：不需要做.eg：I don't need to get up early today .(need在此处为普通动词）
B needn't +dosth 翻译：不必要做.eg:You needn't run so fast.(need 为情态动词是,通常作为否定形式出现）
本句可修改为：You don't need to have an operation .(你不需要做手术）