There is another problem need to be solve/solved?

There is another problem need to be solved?
当然是用“solved”

这个很容易判别， "to be + 过去分词" ----> 被动式
例如: There are lots of things need to be done.（尚有很多事情待办。)

solved，表被动

solved 被动

solved
被动语态呀

solved 问题需要被解决