2015
高考英语人教版一轮复习题库（11）：情态动词与虚拟语气（附解析） 1．—i didn't apologize to him for being unable to inform him of the change in the plan. —but you________. a．ought to have b．have to c．should d．must have 答案 a [句意：——我并没有因为没能告诉他计划中的变化而向他道歉。——但是你应该道歉。根据but可知此处用ought to have＝ought to have done表示(过去)本该做却未做；b.have to不得不；c.should应该，
