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。