The mountains here are all covered up with trees.中为什么要把up去掉?cover up有盖住,遮住的意思,为什么不能用呢?

分类: 作业答案 • 2022-06-23 20:54:55

问题描述：

The mountains here are all covered up with trees.中为什么要把up去掉?
cover up有盖住,遮住的意思,为什么不能用呢?

答