---Have you been working in N0.5 Middle School since you graduated from college?---No, I _______ in the countryside for 3 years.A.have taughtB.had taughtC.have been teachingD.taught
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D解析本题考查动词时态。由问句时态Have you been working可知说话时间是现在和现在在N0.5 Middle School工作；再由“No”可知“并非一直在N0.5 Middle School工作”， 结合这两者点可判断在此之前曾在农村工作了3年。所以选D。