题目内容
9.-Betty went to consult a doctor without asking for a leave yesterday.-How come?But she__ _.( )
A. | should do | B. | must have | C. | might have | D. | ought to have |
分析 昨天Betty没有请假就去看医生了.-怎么回事?她应该会请假的.
解答 答案:D
句意表达的是与过去事实相反的假设,意思是本应该做却没有做的事,要用情态动词加完成时态来构成;must,might表示推测,不符合句意;ought to have后省略了asked for a leave,即she ought to have asked for a leave她本来应该请假的.故选D.
点评 虚拟语气是表示与事实相反的假设,构成方式有:对现在或将来,条件句中用一般过去时态,主语用情态动词加动词原形;对过去,条件句中用过去完成时态,主语用情态动词加完成时态.学习时,要牢记构成方式.
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