Some of the rubbish, such as food, paper and iron, away over a long period of time.
A. rot
B. rots
C. is rotting
D. are rotted
网友回答
A. rot
(答案→)B. rots
C. is rotting
D. are rotted
解析：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.