1、GMAT语法改错有什么技巧吗？

对于语法题真的一点信心都没有，不知道怎么做才好。哪位可以帮忙介绍一下自己做gmat语法改错的好方法，谢谢

2、gmat语法问题

In 2000, a mere two dozen products accounted for half the increase in spending on prescription drugs, a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing many more prescriptions for higher-cost drugs.

A. a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing

B. a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing

C. a phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written

D. which occurred not just because drugs are becoming more expensive but doctors are also writing

E. which occurred not just because of more expensive drugs but because doctors have also written

为啥选b？我认为c更为简练啊？

3、一道GMAT语法改错题，关于定语从句的

when等，我选的C，所以BDE肯定不对现在想问的是，那么GMAT考试有个原则就是介词+which要好于用where，为何这里不选择用C，答案是A？修改部分produce and make it understandable这里是不是定语从句：C本身有错吗.by which it is produced and understood have revealed great complexity rather than underlying simplicityE.of producing and understanding it have revealed not underlying simplicity but great complexityC？A中的it指的是什么，排除C因为主语是research，按照主动优先原则？（限定the processes）若是定语从句.by which one produces and understands it have revealed great complexity instead of underlying simplicity原题中“”符号中粗体字是划线部分.by which it is produced and understood has revealed not underlying simplicity but great complexityD.that produce and make it understandable has revealed great complexity instead of underlying simplicityB，所以后面的谓语肯定是hasResearch during the past several decades on the nature of language and the processes “that produce and make it understandable has revealed great complexity instead of underlying simplicity”，答案是说C的which从句用了被动语态.A

4、GMAT句子改错题，怎么都搞不明白主谓宾了

Floating in the waters of the equatorial Pacific, an array of buoys collects and transmits data on long-term interactions between the ocean and the atmosphere, interactions that affect global climate.

请问这个句子的主谓宾是什么啊 然后怎么看interactions都觉得不应该是个名词 求大神解答~

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