一道英语题目 高手进！！！
1.Glassmilkbottlescanbeusedagainandagain,buttheyneedcleaningthoroughly,_____thty?a.ne...
1.Glass milk bottles can be used again and again,but they need cleaning thoroughly,_____thty? a. needn't b. can't c. aren't d. don't 请说明原因，在线等候....
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