单选题 Everything A could destroy if he B hadn't called the C firemen when the fire D broke out .
【正确答案】 A
【答案解析】解析:根据句义判断,这是一个对过去情况进行假设的虚拟条件句,且everything作主语,与谓语destroy之间又只能构成被动关系,需用被动语态,故A应改为could have been de-stroyed才对.