选择题17. Some of the rubbish, such as food,

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17. 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
答案b,主语是单数？哪个是主语？

Some of the rubbish是主语，such as food, paper and iron是插入语，over a long period of time是一般时间。

B，主语是单数，such as...只做插入语
说的是一个事实，
用一般现在时

句子说的是垃圾，当然垃圾是主语- -

D. are rotted.后面是over a long period of time.

D. are rotted

c