China ________ rapid economic development and political stability over the past three decades, but with them ________ some social problems.A.has seen; has eB.had seen; are ingC.saw; will eD.has seen; have e
网友回答
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。