题目内容
17、Desertification is a growing world problem, and nowadays the United Nations and its member countries _________hard to combat it．
A．are working B．has worked C．work D．worked
试题答案
17、A
相关题目
Desertification is a growing world problem, and nowadays the United Nations and its member countries _________hard to combat it．
A．are working B．has worked C．work D．worked
查看习题详情和答案>>_________ is a growing world problem, and nowadays the United Nations and its member countries _________hard to deal with it．
| A．Desertification; are working | B．Desertified ; worked |
| C．Desert; work | D．Desertification; have worked |