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In the last twenty years, seven Canadian scientists _____ the Nobel prize!
A.wonB.had wonC.was winningD.have won
D

试题分析:考查时态:句意:在过去的20年中,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。
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