The math problem is difficult and of them can work it out.
A. too much; a few
B. much too; a few
C. too much; few
D. much too; few
网友回答
A. too much; a few
B. much too; a few
C. too much; few
(答案→)D. much too; few
解析：much too实际是too要修饰形容词，much是用来加强语气。 too much对应too many；too much后面通常跟不可数名词。Few和a few都用来修饰可数名词，前者表示否定后者表示肯定，根据句意因问题较难，故很少人做出来，因此选D.