---John has put forward______ most challenging question for us to answer.
---Yes, it really is. I have never heard______ harder one.
A.a; the | B.the; the | C.a; a | D.the; a |
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---John has put forward______ most challenging question for us to answer.
---Yes, it really is. I have never heard______ harder one.
A.a; the | B.the; the | C.a; a | D.the; a |