China rapid economic development and political stability over the past three decades but

问题补充：

China rapid economic development and political stability over the past three decades, but with them some social problems.

A. has seen; has come

B. had seen; are coming

C. saw; will come

D. has seen; have come

答案：

A. has seen; has come

B. had seen; are coming

C. saw; will come

(答案→)D. has seen; have come

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。