题目内容
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[主观题]
The scores reported for a certain multiple-choice test were derived by subtracting 1/3 of
the number of wrong answers from the number of right answers. On a 40-question test, if none of the questions was omitted and the score reported was 20, how many wrong answers were there?
A.5
B.10
C.15
D.25
E.30
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