【英语选择()harderonhisscienceproject,hewouldwinthefirstprizeinthecompetiti30.________harderonhisscienceproject,hewouldwinthefirstprizeinthecompetitiontobeheldinHarbin.A.WouldheworkB.ShouldheworkC.Hadheworke】
英语选择()harderonhisscienceproject,hewouldwinthefirstprizeinthecompetiti
30.________harderonhisscienceproject,hewouldwinthefirstprizeinthecompetitiontobeheldinHarbin.
A.WouldheworkB.Shouldhework
C.HadheworkedD.Ifheworks
为什么不选A或D呢.