191.It is not so much the language ______ the cultural background that makes the book difficult to understand.
as
nor
but
like
答案解析
解析：
本题考察固定结构 not so much ... as ... 的用法,意为:与其说是...,倒不如说是...)。 故选 A。句意:与其说是语言,倒不如说是文化背景使这本书很难理解。其他三项不能和 not so much 搭配。
相关知识点：
固定搭配之语言背景记
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