Thereare20mathsproblemsintheeach.Foreachrightanswer,youget0.Foreachwronganswer,youlose2pointsinsteadofgettingpoints(倒扣2分).IfLucygetsamark(分数),whichisaprimemumber(质数),thelargestnumberofmathsproblemssheworksout(解出)is____.
A.13B.15C.16D.17
第一句each改为testsorry,我打错了应该是Foreachrightanswer,youget5,不答得0,答错得-2ok.
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