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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:511

—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; the
C.the; the D.a; a
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—Johnhasputforwardmostchalleng