◎ 题干
How the big forest fire has          remains to be a mystery.
A.turned upB.broken outC.taken placeD.broken up
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“How the big forest fire has remains to be a mystery.A.turned upB.broken outC.taken placeD.broken up…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。