题目内容

Some of the rubbish, such as food, paper and iron, _____ away over a long period of time. 
A.rotB.rotsC.is rottingD.are rotted
B
句子的主干是:Some of the rubbish _____ away over a long period of time. rubbish是不可数名词,谓语动词用单数.
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