Difficult as the problem of pollution is_______,no one should just stop trying

分类: 作业答案 • 2022-01-20 08:48:27

问题描述：

Difficult as the problem of pollution is_______,no one should just stop trying
A.to solve B.to be solve Csolving Dbeing solved

答

a,等于as the problem of pollution is difficult to solve