2. 外语
  3. Milk bottles need cleaning thoroughly before they are used again, ________they?

Milk bottles need cleaning thoroughly before they are used again, ________they?

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问题 Milk bottles need cleaning thoroughly before they are used again, ________they?
选项 A、needn’t
B、don’t
C、mustn’t
D、aren’t
答案B
解析 奶瓶在再次使用前需要彻底清洗，是吗?反意疑问句题。带情态动词dare或need的反意疑问句，疑问部分常用“need／dare+主语”；当dare和need为实义动词时，疑问部分用“助动词do+主语”。该句中的need是实义动词，且陈述部分为肯定，所以应该用助动词do，B项为正确答案。
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