Question

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

1. A.
   has seen; has come
2. B.
   had seen; are coming
3. C.
   saw; will come
4. D.
   has seen; have come

Answer 1

D
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。