(2013·泰安一中月考)—John has put forward most challenging question for us to answer.
—Yes，it really is.I have never heard harder one.
A. the；/
B. /；the
C. the；the
D. a；a
网友回答
A. the；/
B. /；the
C. the；the
(答案→)D. a；a
解析： 第一空most是副词表示“很，十分”；第二空填a表示泛指，该句为I have never heard a harder one than this one的省略。