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

試題分析:考查反義疑問句。But連接兩個并列句，由此判斷反問句是對后面的句中進(jìn)行反問，need做情態(tài)動詞時，后面用動詞原形，由此判斷句中need是實義動詞，所以反義問句要用助動詞do構(gòu)成，正確答案是B。 句意：塑料瓶子能夠被回收利用，但是他們得需要徹底的清洗，是嗎？
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