2015年2月13日GMAT考试刚刚完成了新一轮题库更换，新东方网GMAT频道第一时间为各位考生整理了2015年3月GMAT语法机经（十一），供考生们参考使用，希望对各位备考能有帮助。

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　　When while 放在一句里面考

　　mr. i-don't-remember-his-name-anymore broke his leg yesterday, 【when】 he was riding his bike 【while】 .....失忆

　　【分析】可能是考察Idioms(单独考when和while的区别意义不大= =)

　　while: 有与此同时的意思，同时发生的意味，一般ing多一些。强调动作的同时发生。Jack is eating while John is sleeping.

　　when: 范围更广一些，同时发生的意味没有while来的重。

　　97. (29753-!-item-!-188;#058&003991)

　　Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

　　(A) while at the same time they have introduced some 100,000 dangerous chemical pollutants, having

　　(B) while at the same time introducing some 100,000 dangerous chemical pollutants that have

　　(C) while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have

　　(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have

　　(E) but at the same time introducing some 100,000 dangerous chemical pollutants, having

　　Key: (B)

　　while引导从句时,如主从句的主语一致,且从句谓语又含有 be,则从句主语和 be 可省略。while 后可直接跟现在分词、名词、形容词或介词短语。如:

　　We are teachers while (we are) serving as students.我们边当老师边当学生。

　　(B) 正确, 使用sb do… while doing 结构, 省掉了they, 避免了同第二个they产生指代不清的嫌疑; 使用限定性定语从句符合逻辑意思。

　　想让机经来得更猛烈些？请戳>>2015年3月GMAT语法机经汇总

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(编辑：马荟)