◎ 题干
---What ______ the forest of Yangzhou in the last 30 years?
---Yangzhou has become much greener.
A.has happened toB.was happened to
C.has happened at D.is happening
◎ 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“---What ______ the forest of Yangzhou in the last 30 years?---Yangzhou has become much greener.A.has happened toB.was happened toC.has happened atD.is happenin…”主要考查了你对  【一般现在时】【过去进行时】【过去完成进行时】  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。