—John has put forward _______ most challenging question for us to answer.
—Yes, it really is. I have never heard _______ harder one.A.the; 不填B.不填; theC.the; theD.a; a
网友回答
D解析选D。第一空后的most不是构成最高级，而是表示“很”、“十分”，故其前用a；第二空也填a，该句为 I have never heard a harder one than this one 的省略。