In the past few years Chinese scientists great success in the field of space flight.A. a

问题补充：

In the past few years, Chinese scientists great success in the field of space flight.

A. achieved

B. have achieved

C. won

D. had won

答案：

A. achieved

(答案→)B. have achieved

C. won

D. had won

解析：考察时态及词义辨析.win赢得;achieve取得.句意:在过去的几年中,中国科学家已经在航天领域取得了巨大的成功.结合语境可知本句描述的是现在已经完成动作,故用现在完成时态,选B.