China rapid economic development and political stability over the past three decades, but with them some social problems.
A. has seen; has e
B. had seen; are ing
C. saw; will e
D. has seen; have e
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A. has seen; has e
B. had seen; are ing
C. saw; will e
(答案→)D. has seen; have e
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。