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

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• Milk bottles need cleaning thoroughly before they are used again,___ they?
• 2013年高三英语静安区一摸卷几道语法题25.Children are ranged _____ order of their performance in the last test.A.by B.from C.through D.in 我选B 我记得是B的这个用法啊26.He fell into the couch and turned on the TV,unaware of _____ being a snake lying near his feet.A.it B.there C.that D.one 我选C 这个句子是什么结构啊?28.Beer bottles can be recycled but they need cleaning thoroughly,_____ they?A.needn’t B.can’t C.mustn’t D.don’t答案D 我选B 不懂 33.Before closing the door to his office,he told his secre
• Milk bottles need cleaning thoroughly before they are used again,___ they?don't mustn't aren't
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