7. If a single strain of plant is used for a given crop over a wide area, a practice fostered by modern seed-marketing methods, it increases the likelihood that the impact of a single crop disease or pest will be disastrous.
(A) If a single strain of plant is used for a given crop over a wide area, a practice fostered by modern seed-marketing methods, it
(B) If a single strain of plant is used for a given crop over a wide area, as is fostered by modern seed-marketing methods, it
(C) A practice fostered by modern seed-marketing methods, a single strain of plant used for a given crop over a wide area
(D) A single strain of plant used for a given crop over a wide area, a practice fostered by modern seed-marketing methods,
(E) The use of single strain of plant for a given crop over a wide area, a practice fostered by modern seed-marketing methods,
答案是e我选了d是不是因为d中的used 修饰错阿,可是我又觉得e的主题改变了,我也不太清楚到底哪里错,请各位指教
D, a single strain of plant increases the likelihood意思不对。
in d，a practice....和A single strain of plant不是同一类事务，不能在同谓语
in e，a practice就可以很好解释the use。
a,b 的it指代有问题;c,d做有个特点,两个分句都是对这个方法的解释,谁做主语有歧义,只有e最好.
点醒了我同位语的问题
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