When problems such as energy crisis, pollution and population explosion (?), people are asked to sh(A) are arisen (B) arise (C) arising (D) arisen

问题描述:

When problems such as energy crisis, pollution and population explosion (?), people are asked to sh
(A) are arisen (B) arise (C) arising (D) arisen

B

B,状语从句,缺谓语,排除C,D,arise可直接用作主动语态.