问题描述:
一道英语单项选择,麻烦解释下为什么选,还有其他的选项为甚不行
__________into oceans and rivers is a serious form of pollution.
A.Pouring sewage
B.Empty litter
C.Throwing garbage
D.Dumping sewage
__________into oceans and rivers is a serious form of pollution.
A.Pouring sewage
B.Empty litter
C.Throwing garbage
D.Dumping sewage
问题解答:
我来补答展开全文阅读