问题补充:
单选题China________rapideconomicdevelopmentandpoliticalstabilityoverthepastthreedecades,butwiththem________somesocialproblems.A.has seen; has comeB.had seen; are comingC.saw; will comeD.has seen; have come
答案:
D解析考查时态。over the past three decades表明句子用现在完成时,some social problems作主语,谓语动词用复数,所以选D。