题目

Yesterday, Jane walked away from the heated discussion. Otherwise, she _____ something arbitrary that she would regret forever.A.must have said B.said C.might say D.might have said 答案：【答案】D【解析】考查虚拟语气。句意：昨天Jane离开了那场热烈的讨论，否则她可能会说一些让她永远遗憾的武断的话。otherwise在此相当于if she had not walked away from the discussion，即暗示一个与过去事实相反的虚拟条件句，所以主句要用should/would/could/might+have done。故选D。若A={x|x≥2}，B={x|1＜x≤4}，则A∩B=________；A∪B=________．