Plastic bottles can be recycled but they need cleaning thoroughly, they?
A. needn't
Bdon't
C. mustn't
D. can't
网友回答
A. needn't
(答案→)B. don't
C. mustn't
D. can't
解析：
试题分析:考查反义疑问句。But连接两个并列句，由此判断反问句是对后面的句中进行反问，need做情态动词时，后面用动词原形，由此判断句中need是实义动词，所以反义问句要用助动词do构成，正确答案是B。 句意：塑料瓶子能够被回收利用，但是他们得需要彻底的清洗，是吗？