[What are books make of ]这句话哪里错了?“[What are books make of ]这句话

问题描述:

[What are books make of ]这句话哪里错了?“[What are books make of ]这句话
[What are books make of ]这句话哪个词错了?

因该是what are books made of?
这里是被动,应该用make的过去分词made