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

分类: 作业答案 • 2022-01-02 15:24:37

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

答

B,状语从句,缺谓语,排除C,D,arise可直接用作主动语态.