问题 更新时间2023/4/3 12:59:00 38、(单选、2.5分)________ about it earlier, we could have warned people of the danger.A、Would we knowB、Should we knowC、Have we knownD、Had we known 答案 登录 注册 D 出自:棉花糖 >> 河北工程技术学院大学英语1