一小段英语短文的改错7---在线等

一小段英语短文的改错7---在线等
Two women on a train were arguing.At last one of them called the conductor.She said,“If this window is opened（open）,I will catch a cold.And I may die.” The other woman said,“But if this window is shutted（shut）,I’ll feel difficult in breathing.I’ll die.” The conductor didn’t know what to do.A man had been listening all the time.He said that he had an idea.“First open the window.That will kill one.” He said,“Next shut it.That will kill the other.Then we can have peace.”
括号里的为正确答案
open可以做动词,也可以做形容词,答案说用形容词做表语.我知道,这样是正确的.但我觉得即使保留用被动语态就不对了吗?