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题库 / GMATLA-SC-133
Research 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.
that produce and make it understandable has revealed great complexity instead of underlying simplicity
of producing and understanding it have revealed not underlying simplicity but great complexity
by which it is produced and understood has revealed not underlying simplicity but great complexity
by which it is produced and understood have revealed great complexity rather than underlying simplicity
by which one produces and understands it have revealed great complexity instead of underlying simplicity
题目分析：
略。
选项分析：
A选项：Correct. 本选项在语法和逻辑上均是正确的。
B选项：本选项具有“主谓一致”的错误。整个句子的主语是一个单数名词——research，所以其谓语动词也应该用单数以保证体态一致，应该用has revealed，而不是have revealed。
C选项：本选项的主要问题在于by which it is produced and understood这个定语从句。先行词process在从句中做by身后的对象，放进定语从句则有：
language is produced by process and is understood by process.
and前的部分和选项A相同，主被动之间可认为没什么区别。但and身后的部分不对。过程不能发出“理解语言”这一动作，只能让语言变得可以理解。
D选项：by which身后的定语从句错误同选项(C)。主谓一致错误同选项(B)。
E选项：it指代错误同选项(C)。主谓一致错误同选项(B)。
我的想法是这样的。
首先解决一下关于it的指代问题，毫无疑问，在A和C当中，想要句子语义正确，it的指代对象都是language，因此错误点不在于此。
那么就是比较the process produce and make the language understandable以及the language is produced and understood by the process 这两句话了。
首先，被动语态使用的原因是不知道动作的发出者是谁，但很显然，这句话中已经给出了动作的发出者，即process（即便在被动语态的选项中，动作发出者也已经很明确了），因此这种情况下，主动肯定是要优先于被动进行选择的。
其次，再说一下the language is understandable by the process这个小句，完全说不通对不对，因此这个题的答案应该就是选择A选项了。
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