问题标题:
lthinkwe_______learntobeusefultopeople,soit'snecessaryforustotakepartinsocialactivitiesfromtimetotime.A.mayB.oughttoC.canD.need
问题描述:

lthinkwe_______learntobeusefultopeople,soit'snecessaryforustotakepartinsocial

activitiesfromtimetotime.A.mayB.oughttoC.canD.need

牛斌回答:
  B.oughtto应该
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