题目内容

Plastic bottles can be recycled but they need cleaning thoroughly, _______ they?
A．needn'tB． don'tC．mustn'tD．can't
B

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？
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