题目内容
Every means ______ prevent the water from ______.
| A.are used to; polluting | B.is used to; polluting |
| C.is used to; polluted | D.is used to; being polluted |
D
略
练习册系列答案
相关题目
题目内容
| A.are used to; polluting | B.is used to; polluting |
| C.is used to; polluted | D.is used to; being polluted |