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12: is considered
13:filled with
14: is being thrown
13:filled with
14: is being thrown
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第一题选B,第二题选B,第三题:Litter are throwed into the river by people
望采纳,谢谢~~~
望采纳,谢谢~~~
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BB
are being thrown
are being thrown
追答
前面的两个选B
are being thrown是第三个
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