单选题 This question is so difficult that ______ people are able even to understand it.

【正确答案】 C
【答案解析】[精析] 本题考查不定代词的用法。few几乎没有；a few有几个，用来修饰可数名词。根据题意，C项正确。
[知识拓展] little几乎没有；a little有一点，用来修饰不可数名词。