问题标题:
Whenproblemssuchasenergycrisis,pollutionandpopulationexplosion(?),peopleareaskedtosh(A)arearisen(B)arise(C)arising(D)arisen
问题描述:

Whenproblemssuchasenergycrisis,pollutionandpopulationexplosion(?),peopleareaskedtosh

(A)arearisen(B)arise(C)arising(D)arisen

倪卫明回答:
  B,状语从句,缺谓语,排除C,D,arise可直接用作主动语态.
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