XDF补充教材250-7

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 method,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 a single strain of plant for a given crop over a wide area, a practice fostered by modern seed-marketing methods,

答案选E，我选B。哪位牛人能解释解释句子结构呀，我当初一看到这题就晕掉了，有什么好办法做这题？

这个是OG的解释，比任何人的解释都好

另外，楼主有没有下载 “大全注释”呢，好好利用CD的资源，一定对你有很多帮助的

OG解释中的 the appositive a practice each lack a noun referent， 为什么practice这个名词需要一个指代对象呀？practice做谁的同位语？哪个牛人能分析一下句子结构？

还有，OG解释是哪里找来的？

【必读ＦＡＱ】─ ─ [Best of Best]GMAT备考全过程  

好好研究一下

AB都是不知所云, it指代的十分不明确, 相比之下E多爽快.