that do,that doing,that done

题目

that do,that doing,that done
记得that是代词时,所代指的东西=that）,它与后面的do的关系（主动,被动）决定了动词的形式（doing or done）那 that do
.sculptures that belong to part of our nation's cultural heritage
.they also need to understand what changes could be made to air pollution sources that cause the prolem（这句话不会翻译.）
好像还有that be .额 ,
他们也需要了解对于空气污染有什么样的变化that cause the problem。
全句是
to solve the acid rain problem,people need to understand how acid rain cause damage to the environment .they also need to understand what changes could be made to air pollution sources that cause the problem.

答案

翻译好解决点就先说下翻译了：they also need to understand what changes could be made to air pollution sources that cause the problem.他们同时得知道怎样的改变可能会变成造成这个问题的空气污染源主句是 the...