In addition to a two-party system, there are still several minor parties, such as Libertarian Party, the Green Party and Constitution Party in the United States, ________________________.A. even though these minor parties have very practical importanceB. even though these minor parties have some practical importanceC. even though these minor parties have very little practical importanceD. even though these minor parties have no practical importance at all

本题考查对美国政党体系中小党派实际作用的理解。关键在于明确“minor parties”（小党派）在美国政治中的地位：虽然存在，但实际影响力有限。需根据语境选择最符合逻辑的让步状语从句，强调“尽管小党派存在，但其实际作用不大”。

选项分析

选项A

even though these minor parties have very practical importance

• 错误：若小党派“非常重要”，则与美国政治中“两党主导”的事实矛盾。

选项B

even though these minor parties have some practical importance

• 问题：虽然“有一定作用”看似合理，但“some”（一些）的表述不够准确。小党派的实际影响更接近“微乎其微”。

选项C

even though these minor parties have very little practical importance

• 正确：美国小党派通常难以赢得全国性选举，仅在特定议题或地方层面有微弱影响，符合“very little”（非常少）。

选项D

even though these minor parties have no practical importance at all

• 错误：绝对化表述“完全没有作用”不符合事实。例如，绿党曾影响局部选举结果。