In the last twenty years seven Canadian scientists the Nobel prize! A. wonB. had wonC.

问题补充：

In the last twenty years, seven Canadian scientists the Nobel prize!

A. won

B. had won

C. was winning

D. have won

答案：

A. won

B. had won

C. was winning

(答案→)D. have won

解析：考查时态：句意：在过去的中，7个加拿大科学家获得了诺贝尔奖。时间状语是. In the last twenty years,一般和现在完成时连用，选D。